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A132374 Expansion of c(7x^2)/(1-xc(7x^2)), where c(x) is the g.f. of A000108 . 9
1, 1, 8, 15, 120, 274, 2192, 5531, 44248, 118686, 949488, 2654646, 21237168, 61189668, 489517344, 1443039123, 11544312984, 34648845862, 277190766896, 844131474530, 6753051796240, 20813234394492, 166505875155936, 518373091849502 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Hankel transform is 7^C(n+1,2) . Series reversion of x(1+x)(1+2x+8x^2) .

LINKS

Table of n, a(n) for n=0..23.

FORMULA

a(n) = Sum_{k, 0<=k<=n}A120730(n,k)*7^(n-k).

CROSSREFS

Cf. A000012, A001405, A126087, A128386, A121724, A128387, A121725.

Sequence in context: A189003 A110294 A110459 * A234534 A067686 A283821

Adjacent sequences:  A132371 A132372 A132373 * A132375 A132376 A132377

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Nov 10 2007

STATUS

approved

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Last modified October 23 06:29 EDT 2018. Contains 316520 sequences. (Running on oeis4.)