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A156362 a(2n+2)=8*a(2n+1), a(2n+1)=8*a(2n)-7^n*A000108(n), a(0)=1 . 3
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; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform is 7^C(n+1,2).

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n)=sum{k=0..n, A120730(n,k)*7^k}.

CROSSREFS

Cf. A000108, A156266, A001405, A151281, A151162, A151254, A156195, A156361.

Sequence in context: A229248 A242159 A057090 * A055274 A152776 A155197

Adjacent sequences:  A156359 A156360 A156361 * A156363 A156364 A156365

KEYWORD

nonn

AUTHOR

Philippe Deléham, Feb 08 2009

STATUS

approved

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Last modified February 20 16:25 EST 2018. Contains 299380 sequences. (Running on oeis4.)