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A363580
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G.f. satisfies A(x) = exp( Sum_{k>=1} A(x^k) * x^k/(k * (1 + 2*x^k)) ).
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4
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1, 1, 0, 2, 0, 2, 1, 6, -2, 11, -1, 30, -21, 76, -60, 223, -245, 653, -817, 2031, -2935, 6521, -10067, 21455, -35425, 72152, -123756, 246752, -436854, 855852, -1546777, 3001811, -5513604, 10630676, -19747742, 37949424, -71115077, 136415279, -257301742, 493313335
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OFFSET
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0,4
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LINKS
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FORMULA
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A(x) = (1 + 2*x) * B(x) where B(x) is the g.f. of A363578.
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PROG
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(PARI) seq(n) = my(A=1); for(i=1, n, A=exp(sum(k=1, i, subst(A, x, x^k)*x^k/(k*(1+2*x^k)))+x*O(x^n))); Vec(A);
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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