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Search: id:A146880
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| A146880 |
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A symmetrical triangle sequence of coefficients : p(x,n)=If[n == 0, 1, (x + 1)^n + Sum[(1 + Mod[Binomial[n, m], 2])*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]]. |
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1
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| 1, 1, 1, 1, 4, 1, 1, 7, 7, 1, 1, 6, 8, 6, 1, 1, 9, 12, 12, 9, 1, 1, 8, 19, 22, 19, 8, 1, 1, 11, 25, 39, 39, 25, 11, 1, 1, 10, 30, 58, 72, 58, 30, 10, 1, 1, 13, 38, 86, 128, 128, 86, 38, 13, 1, 1, 12, 49, 122, 212, 254, 212, 122, 49, 12, 1
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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Row sums are:{1, 2, 6, 16, 22, 44, 78, 152, 270, 532, 1046}.
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FORMULA
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p(x,n)=If[n == 0, 1, (x + 1)^n + Sum[(1 + Mod[Binomial[n, m], 2])*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]]; t(n,m)=coefficients(p(x,n)).
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EXAMPLE
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{1}, {1, 1}, {1, 4, 1}, {1, 7, 7, 1}, {1, 6, 8, 6, 1}, {1, 9, 12, 12, 9, 1}, {1, 8, 19, 22, 19, 8, 1}, {1, 11, 25, 39, 39, 25, 11, 1}, {1, 10, 30, 58, 72, 58, 30, 10, 1}, {1, 13, 38, 86, 128, 128, 86, 38, 13, 1}, {1, 12, 49, 122, 212, 254, 212, 122, 49, 12, 1}
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MATHEMATICA
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Clear[p, x, n]; p[x_, n_] = If[ n == 0, 1, (x + 1)^n +Sum[(1 + Mod[Binomial[n, m], 2])*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]]; Table[CoefficientList[FullSimplify[ExpandAll[p[x, n]]], x], {n, 0, 10}]; Flatten[%]
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CROSSREFS
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Sequence in context: A010321 A046550 A016521 this_sequence A152236 A157172 A131060
Adjacent sequences: A146877 A146878 A146879 this_sequence A146881 A146882 A146883
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Nov 02 2008
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