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Search: id:A016133
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| A016133 |
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Expansion of 1/((1-2x)(1-9x)). |
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+0
2
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| 1, 11, 103, 935, 8431, 75911, 683263, 6149495, 55345711, 498111911, 4483008223, 40347076055, 363123688591, 3268113205511, 29413018865983, 264717169826615, 2382454528505071, 21442090756676711, 192978816810352543
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OFFSET
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0,2
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FORMULA
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a(n) = 11*a(n-1) - 18*a(n-2).
a(n)=9a(n-1)+4a(n-2)-36a(n-3) ; a(n)=9a(n-1)+2^n. - Paul Curtz (bpcrtz(AT)free.fr), Feb 14 2008
a(n)=-(2/7)*2^n+(9/7)*9^n, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 16 2008
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CROSSREFS
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Adjacent sequences: A016130 A016131 A016132 this_sequence A016134 A016135 A016136
Sequence in context: A099294 A081552 A141915 this_sequence A077250 A099839 A075183
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KEYWORD
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nonn
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AUTHOR
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njas
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