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 A307522 Expansion of Product_{k>=1} ((1 + x)^k - x^k)/((1 + x)^k + x^k). 2
 1, -2, 2, -2, 4, -10, 22, -42, 72, -116, 188, -332, 662, -1432, 3148, -6736, 13784, -26894, 50254, -90782, 160856, -285230, 518170, -983710, 1964800, -4090002, 8705322, -18582722, 39219572, -81148034, 163946630, -323136562, 622125982, -1173528562, 2179230066 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA G.f.: theta_4(x/(1 + x)), where theta_4() is the Jacobi theta function. PROG (PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, ((1+x)^k-x^k)/((1+x)^k+x^k))) CROSSREFS Cf. A002448, A307520, A307521, A318570. Sequence in context: A293177 A231382 A213270 * A130707 A131562 A260786 Adjacent sequences:  A307519 A307520 A307521 * A307523 A307524 A307525 KEYWORD sign AUTHOR Seiichi Manyama, Apr 12 2019 STATUS approved

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Last modified January 17 09:52 EST 2020. Contains 330949 sequences. (Running on oeis4.)