A134087 - OEIS

A134087

a(n) = [x^n] G(x)^(2^(n+1)) where G(x) satisfies: [x^(n+1)] G(x)^(2^n) = [x^n] G(x)^(2^n) for n>=0 and G(2x) is the g.f. of A134084.

1, 4, 32, 672, 42816, 8822400, 6065609984, 14256471226880, 117000916309144576, 3410202131850138806272, 357670541003601468527333376, 136391046228660672398602237353984

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..11.

FORMULA

a(n) = 2^n * A134089(n).

PROG

(PARI) {a(n)=local(A=[1], B); for(i=1, n, A=concat(A, 0); B=Vec(Ser(A)^(2^(#A-2))); A[ #A]=(B[ #B-1]-B[ #B])/2^(#A-2)); Vec(Ser(A)^(2^(n+1)))[n+1]}

CROSSREFS

Cf. A134084, A134085, A134086, A134088, A134089.

Sequence in context: A006024 A118995 A222829 * A132854 A136471 A243918

Adjacent sequences: A134084 A134085 A134086 * A134088 A134089 A134090

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Oct 26 2007

STATUS

approved