The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A335091

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

a(n) = ((2*n+1)!!)^3 * (Sum_{k=1..n} 1/(2*k+1)^3).
(history; published version)

#23 by Bruno Berselli at Thu Apr 29 04:34:13 EDT 2021

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reviewed

approved

#22 by Joerg Arndt at Thu Apr 29 03:52:31 EDT 2021

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proposed

reviewed

#21 by Amiram Eldar at Thu Apr 29 02:36:55 EDT 2021

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editing

proposed

#20 by Amiram Eldar at Thu Apr 29 02:15:20 EDT 2021

MATHEMATICA

a[n_] := ((2*n + 1)!!)^3 * Sum[1/(2*k + 1)^3, {k, 1, n}]; Array[a, 14, 0] (* Amiram Eldar, Apr 29 2021 *)

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approved

editing

#19 by Vaclav Kotesovec at Fri Sep 25 04:10:24 EDT 2020

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editing

approved

#18 by Vaclav Kotesovec at Fri Sep 25 04:10:20 EDT 2020

FORMULA

a(n) ~ (7*zeta(3)/8 - 1) * 2^(3*n + 9/2) * n^(3*n + 3) / exp(3*n). - Vaclav Kotesovec, Sep 25 2020

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approved

editing

#17 by Michel Marcus at Sat Sep 12 02:24:58 EDT 2020

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reviewed

approved

#16 by Joerg Arndt at Sat Sep 12 02:08:05 EDT 2020

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proposed

reviewed

#15 by Seiichi Manyama at Sat Sep 12 01:44:10 EDT 2020

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editing

proposed

#14 by Seiichi Manyama at Sat Sep 12 01:21:30 EDT 2020

CROSSREFS

Column k=3 of A335095.