The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A330517 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A330517

Expansion of e.g.f. Product_{k>=1} sech(x^k) (even powers only).
(history; published version)

#5 by Susanna Cuyler at Tue Dec 17 08:41:29 EST 2019

STATUS

proposed

approved

#4 by Ilya Gutkovskiy at Tue Dec 17 06:47:39 EST 2019

STATUS

editing

proposed

#3 by Ilya Gutkovskiy at Tue Dec 17 06:12:28 EST 2019

CROSSREFS

Cf. A000364, A203716, A229263, A270294, A270662, A270663, A270664, A270665, A270666, A330514, A330515, A330516.

#2 by Ilya Gutkovskiy at Tue Dec 17 06:04:56 EST 2019

NAME

allocated for Ilya GutkovskiyExpansion of e.g.f. Product_{k>=1} sech(x^k) (even powers only).

DATA

1, -1, -7, -241, -4495, -652801, -15004375, -7047990769, 1597056262625, -360304327144321, 286464442762907225, 560117092794518159, 78257061390674957994065, 5684812583023438995911039, 45666128878264725133259682185

OFFSET

0,3

MATHEMATICA

nmax = 14; Table[(CoefficientList[Series[Product[Sech[x^k], {k, 1, nmax}], {x, 0, 2 nmax}], x] Range[0, 2 nmax]!)[[n]], {n, 1, 2 nmax + 1, 2}]

CROSSREFS

Cf. A000364, A203716, A229263, A270294, A270662, A270663, A270664, A270665, A270666.

KEYWORD

allocated

sign

AUTHOR

Ilya Gutkovskiy, Dec 17 2019

STATUS

approved

editing

#1 by Ilya Gutkovskiy at Tue Dec 17 06:04:56 EST 2019

NAME

allocated for Ilya Gutkovskiy

KEYWORD

allocated

STATUS

approved