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A303441 Expansion of Product_{k>=1} ((1 - (2^k*x)^k)/(1 + (2^k*x)^k))^(1/2^k). 2
1, -2, -6, -116, -7914, -2080044, -2143234268, -8791784539464, -144097582730402202, -9444444682320960008908, -2475861188239098437867827380, -2596143477450571483513272599120280, -10889030549158315918778789768740624543108 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..58

FORMULA

a(n) ~ -2^(n^2 - n + 1). - Vaclav Kotesovec, Apr 25 2018

PROG

(PARI) N=20; x='x+O('x^N); Vec(prod(k=1, N, ((1-(2^k*x)^k)/(1+(2^k*x)^k))^(1/2^k)))

CROSSREFS

Cf. A303306, A303394, A303395, A303440.

Sequence in context: A156500 A264889 A231537 * A075391 A212158 A058251

Adjacent sequences:  A303438 A303439 A303440 * A303442 A303443 A303444

KEYWORD

sign

AUTHOR

Seiichi Manyama, Apr 24 2018

STATUS

approved

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Last modified October 1 19:39 EDT 2022. Contains 357167 sequences. (Running on oeis4.)