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A331484 Expansion of 1/(1 + x*Product_{k>=1} (1 - x^k)). 5
1, -1, 2, -2, 3, -3, 3, -2, -1, 5, -13, 22, -36, 51, -68, 82, -86, 75, -31, -52, 201, -421, 732, -1125, 1575, -2024, 2344, -2370, 1807, -327, -2532, 7210, -14128, 23486, -35027, 47799, -59594, 66717, -63246, 41012, 10696, -104335, 252653, -465825, 746343 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(0) = 1, a(n) = -Sum_{k=1..n} A010815(k-1)*a(n-k) for n > 0.
MATHEMATICA
m = 44; CoefficientList[Series[1/(1 + x*Product[1 - x^k, {k, 1, m}]), {x, 0, m}], x] (* Amiram Eldar, May 05 2021 *)
PROG
(PARI) N=66; x='x+O('x^N); Vec(1/(1+x*prod(k=1, N, 1-x^k)))
CROSSREFS
Cf. similar sequences: A067687, A299105, A299106, A299208, A302017, A318581, A318582.
Cf. A010815.
Sequence in context: A357622 A357621 A220604 * A046918 A238732 A060287
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jan 18 2020
STATUS
approved

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Last modified March 29 03:51 EDT 2024. Contains 371264 sequences. (Running on oeis4.)