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Search: id:A016191
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| A016191 |
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Expansion of 1/((1-9x)(1-12x)). |
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+0
2
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| 1, 21, 333, 4725, 63261, 818181, 10349613, 128978325, 1590786621, 19476859941, 237209103693, 2877890303925, 34817113183581, 420347224031301, 5067043480830573, 61010412902061525, 733977975013590141
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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(12^(n+1)-9^(n+1))/3 - Lambert Klasen (lambert.klasen(AT)gmx.net), Feb 05 2005
a(n-1)=Sum(3^(n-1)*3^(n-k)*binomial(n, k),k=1..n). - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Sep 24 2006
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CROSSREFS
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Sequence in context: A011810 A091947 A016195 this_sequence A095905 A051525 A107396
Adjacent sequences: A016188 A016189 A016190 this_sequence A016192 A016193 A016194
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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