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Search: id:A097090
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| A097090 |
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Integer coefficients in function A(x) such that A(A(x)) = x*(1+2*x)^2. |
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+0
2
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| 0, 1, 2, -2, 6, -22, 80, -228, 18, 6694, -65604, 396804, -1336332, -2510244, 64799884, -302351144, -1410221598, 23754923526, 16833211660, -2598949277964, 14767224078420, 229529725999500, -3478598282993328, -13287810766972728, 667271251276705140, -1630867775606147844
(list; graph; listen)
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OFFSET
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0,3
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PROGRAM
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(PARI) {a(n)=local(A, B, F); F=x*(1+2*x+x*O(x^n))^2; A=F; for(i=0, n, B=serreverse(A); A=(A+subst(B, x, F))/2); polcoeff(A, n, x)}
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CROSSREFS
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Sequence in context: A103179 A004077 A007985 this_sequence A085403 A112478 A138801
Adjacent sequences: A097087 A097088 A097089 this_sequence A097091 A097092 A097093
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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), Jul 23 2004
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