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Search: id:A152969
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| A152969 |
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Triangle read by rows: T(n,m)=floor[(m/n)*row(n)]. |
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+0
1
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| 1, 1, 1, 1, 6, 1, 1, 23, 23, 1, 1, 48, 286, 48, 1, 1, 384, 1535, 1535, 384, 1, 1, 3840, 7680, 23038, 7680, 3840, 1, 1, 46080, 92160, 184319, 184319, 92160, 46080, 1, 1, 645120, 1290240, 1935360, 2580478, 1935360, 1290240, 645120, 1, 1, 10321920, 20643840
(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: A000165
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EXAMPLE
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{1},
{1, 1},
{1, 6, 1},
{1, 23, 23, 1},
{1, 48, 286, 48, 1},
{1, 384, 1535, 1535, 384, 1},
{1, 3840, 7680, 23038, 7680, 3840, 1},
{1, 46080, 92160, 184319, 184319, 92160, 46080, 1},
{1, 645120, 1290240, 1935360, 2580478, 1935360, 1290240, 645120, 1},
{1, 10321920, 20643840, 30965760, 30965759, 30965759, 30965760, 20643840, 10321920, 1},
{1, 185794560, 371589120, 557383680, 743178240, -2, 743178240, 557383680, 371589120, 185794560, 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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Sequence in context: A142596 A155467 A152936 this_sequence A060187 A156139 A155863
Adjacent sequences: A152966 A152967 A152968 this_sequence A152970 A152971 A152972
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KEYWORD
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nonn,tabl
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Dec 16 2008
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Jan 31 2009
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