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A171209 G.f. satisfies: A(x) = (1 + x*A(2x))^7. 3
1, 7, 119, 3955, 247093, 29355725, 6770018269, 3075928905505, 2774997766597238, 4989660046676105752, 17913062958150482828608, 128508635121001835101510976, 1843071985575998120371392747776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

FORMULA

Self-convolution 7th power of A171208 where a(n) = A171208(n+1)/2^n for n>=0.

PROG

(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=(1+x*subst(A, x, 2*x))^7); polcoeff(A, n)}

CROSSREFS

Cf. A135868, A171200-A171207, A171208, A171210-A171211.

Sequence in context: A304917 A113667 A192565 * A296731 A092612 A263943

Adjacent sequences:  A171206 A171207 A171208 * A171210 A171211 A171212

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 05 2009

STATUS

approved

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Last modified August 24 03:51 EDT 2019. Contains 326260 sequences. (Running on oeis4.)