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Search: id:A166153
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| A166153 |
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a(n)= (7^n+14*(-8)^n)/15. |
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+0
3
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| 1, -7, 63, -455, 3983, -29463, 252511, -1902439, 16043055, -122579639, 1020990719, -7885450503, 65060930767, -506646158935, 4150058281887, -32522243182247, 264925506967919, -2086171125173751, 16921999515377215
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(0)= 1, a(1)= -7, a(n)= 56*a(n-2)-a(n-1) for n>1. G.f.: (1-6x)/(1+x-56*x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)*(-8)^k.
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CROSSREFS
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Cf. A166035, A166036, A166149, A166152
Sequence in context: A100741 A043027 A165759 this_sequence A123009 A024088 A155132
Adjacent sequences: A166150 A166151 A166152 this_sequence A166154 A166155 A166156
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KEYWORD
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easy,sign
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 08 2009
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