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Search: id:A154251
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| A154251 |
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Expansion of (1-x+7x^2)/((1-x)(1-2x)). |
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+0
3
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| 1, 2, 11, 29, 65, 137, 281, 569, 1145, 2297, 4601, 9209, 18425, 36857, 73721, 147449, 294905, 589817, 1179641, 2359289, 4718585, 9437177, 18874361, 37748729, 75497465, 150994937, 301989881, 603979769, 1207959545, 2415919097
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Binomial transform of 1,1,8,1,8,1,8,1,8,1,8,1,8,1,8,...
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FORMULA
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a(n)=3*a(n-1)-2*a(n-2), n>2 ; a(0)=1, a(1)=2, a(2)=11 . a(n)=9*2^(n-1)-7, n>0 ; a(0)=1 . a(n)=2*a(n-1)+7, n>1 ; a(0)=1, a(1)=2 .
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CROSSREFS
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Cf.: A094373, A000079, A083329, A095121, A154117, A131128, A154118, A131130
Sequence in context: A117560 A024178 A009312 this_sequence A092275 A086252 A106926
Adjacent sequences: A154248 A154249 A154250 this_sequence A154252 A154253 A154254
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jan 05 2009
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