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Search: id:A107699
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| 1, 1, -2, 13, -145, 2328, -49784, 1358965, -46076544, 1902202515, -94104681660, 5503867176832, -376096374571125, 29714871818774044, -2689473418781240320, 276562260699626541509, -32073434441440654231749, 4167256779254698145624064, -603002974281204853457239860
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OFFSET
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1,3
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FORMULA
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G.f.: A(x) = (G(x) - G(-x))/2, where G(x) is the g.f. of A107700 and satisfies: G(G(x)) = x + 2*G(x)^2.
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PROGRAM
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(PARI) {a(n)=local(A, B, F); A=x+x^2+x*O(x^(2*n)); if(n<1, 0, for(i=0, 2*n, F=x+2*A^2; B=serreverse(A); A=(A+subst(B, x, F))/2); polcoeff(A, 2*n-1, x))}
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CROSSREFS
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Cf. A107700, A107701.
Sequence in context: A003581 A129256 A046245 this_sequence A079330 A059367 A069736
Adjacent sequences: A107696 A107697 A107698 this_sequence A107700 A107701 A107702
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KEYWORD
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sign
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), May 21 2005
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