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A156362
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a(2n+2)=8*a(2n+1), a(2n+1)=8*a(2n)-7^n*A000108(n), a(0)=1 .
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3
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1, 7, 56, 441, 3528, 28126, 225008, 1798349, 14386792, 115060722, 920485776, 7363180314, 58905442512, 471228010428, 3769824083424, 30158239367445, 241265914939560, 1930119075851050, 15440952606808400, 123527424655229966
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Hankel transform is 7^C(n+1,2).
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FORMULA
| a(n)=sum{k=0..n, A120730(n,k)*7^k}.
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CROSSREFS
| Cf. A000108, A156266, A001405, A151281, A151162, A151254, A156195, A156361.
Sequence in context: A092315 A092318 A057090 * A055274 A152776 A155197
Adjacent sequences: A156359 A156360 A156361 * A156363 A156364 A156365
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KEYWORD
| nonn
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 08 2009
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