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Search: id:A152971
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| A152971 |
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A vector sequence with set row sum function: row(n)=(2*n)!/n! and linear build up and decline function: f(n,m)=Floor[(m/n)*row(n)]. |
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+0
1
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| 1, 1, 1, 1, 10, 1, 1, 59, 59, 1, 1, 210, 1258, 210, 1, 1, 3024, 12095, 12095, 3024, 1, 1, 55440, 110880, 332638, 110880, 55440, 1, 1, 1235520, 2471040, 4942079, 4942079, 2471040, 1235520, 1, 1, 32432400, 64864800, 97297200, 129729598, 97297200
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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row sums (2*n)!/n!:
{1, 2, 12, 120, 1680, 30240, 665280, 17297280, 518918400, 17643225600, 67044257280,...}
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FORMULA
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row(n)=(2*n)!/n!: f(n,m)=Floor[(m/n)*row(n)].
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EXAMPLE
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{1},
{1, 1},
{1, 10, 1},
{1, 59, 59, 1},
{1, 210, 1258, 210, 1},
{1, 3024, 12095, 12095, 3024, 1},
{1, 55440, 110880, 332638, 110880, 55440, 1},
{1, 1235520, 2471040, 4942079, 4942079, 2471040, 1235520, 1},
{1, 32432400, 64864800, 97297200, 129729598, 97297200, 64864800, 32432400, 1},
{1, 980179200, 1960358400, 2940537600, 2940537599, 2940537599, 2940537600, 1960358400, 980179200, 1},
{1, 33522128640, 67044257280, 100566385920, 134088514560, -2, 134088514560, 100566385920, 67044257280, 33522128640, 1}
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MATHEMATICA
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Clear[v, n, row, f]; row[n_] = (2*n)!/n!;
f[n_, m_] = Floor[(m/n)*row[n]/2]; v[0] = {1}; v[1] = {1, 1};
v[n_] := v[n] = If[Mod[n, 2] == 0, Join[{1}, Table[ f[n, m], {m, 1, Floor[ n/2] - 1}], {row[n] - 2*Sum[ f[n, m], {m, 1, Floor[n/2] - 1}] - 2}, Table[ f[n, m], {m, Floor[n/ 2] - 1, 1, -1}], { 1}],
Join[{1}, Table[ f[n, m], {m, 1, Floor[n/2] - 1}], {row[n]/2 - Sum[ f[n, m], { m, 1, Floor[n/2] - 1}] - 1, row[n]/ 2 - Sum[ f[n, m], {m, 1, Floor[ n/2] - 1}] - 1}, Table[ f[n, m], {m, Floor[n/ 2] - 1, 1, -1}], {1}]];
Table[v[n], {n, 0, 10}]; Flatten[%]
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CROSSREFS
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A142459
Sequence in context: A157277 A157629 A154336 this_sequence A142459 A157641 A129274
Adjacent sequences: A152968 A152969 A152970 this_sequence A152972 A152973 A152974
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KEYWORD
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nonn,tabl,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Dec 16 2008
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