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 A305355 Expansion of Product_{k>=1} (1 - x^(k*(3*k-1)/2)). 3
 1, -1, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, -1, 1, 0, 0, 0, 1, -1, 0, 0, 0, -1, 1, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 1, -2, 1, 0, 0, -1, 2, -1, 0, 0, 0, 0, 0, 1, -1, 0, 0, -1, 0, 1, 0, 0, 1, 0, -1, 0, 0, 0, -1, 2, -1, 0, 0, 0, -1, 0, 0, 1, 0, 1, 0, 0, -1, 0, -1, 1, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,36 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..10000 Wikipedia, Pentagonal number MAPLE seq(coeff(series(mul(1-x^(k*(3*k-1)/2), k=1..n), x, n+1), x, n), n=0..140); # Muniru A Asiru, May 31 2018 CROSSREFS Product_{k>=1} (1 - x^(k*((m-2)*k-(m-4))/2)): A292518 (m=3), A276516 (m=4), this sequence (m=5). Cf. A000326, A218379, A218380. Sequence in context: A107628 A268389 A288969 * A218380 A152815 A115296 Adjacent sequences:  A305352 A305353 A305354 * A305356 A305357 A305358 KEYWORD sign AUTHOR Seiichi Manyama, May 31 2018 STATUS approved

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Last modified September 16 05:49 EDT 2021. Contains 347469 sequences. (Running on oeis4.)