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A171203
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G.f. satisfies: A(x) = (1 + x*A(2x))^4.
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3
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1, 4, 38, 708, 24961, 1682688, 220959136, 57266675520, 29497077110720, 30294634141775360, 62134850895148484608, 254691311135373319017472, 2087196424913845641682560512, 34202892422993270952623113994240
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..13.
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FORMULA
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Self-convolution 4-th power of A171202 where a(n) = A171202(n+1)/2^n for n>=0.
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PROG
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(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=(1+x*subst(A, x, 2*x))^4); polcoeff(A, n)}
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CROSSREFS
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Cf. A135868, A171200, A171201, A171202, A171204-A171211.
Sequence in context: A177382 A201861 A171779 * A096332 A084284 A084285
Adjacent sequences: A171200 A171201 A171202 * A171204 A171205 A171206
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna, Dec 05 2009
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STATUS
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approved
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