The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A307811 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A307811

Expansion of 1/AGM(1-45*x, sqrt((1-25*x)*(1-81*x))).
(history; published version)

#20 by Peter Luschny at Thu May 13 02:35:31 EDT 2021

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reviewed

approved

#19 by Michel Marcus at Thu May 13 01:59:51 EDT 2021

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proposed

reviewed

#18 by Amiram Eldar at Thu May 13 01:57:11 EDT 2021

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editing

proposed

#17 by Amiram Eldar at Thu May 13 01:52:36 EDT 2021

MATHEMATICA

a[n_] := Sum[5^(n-k) * Binomial[n, k] * Binomial[2*k, k], {k, 0, n}]^2; Array[a, 16, 0] // Flatten (* Amiram Eldar, May 13 2021 *)

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approved

editing

#16 by Vaclav Kotesovec at Fri Sep 27 17:05:37 EDT 2019

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editing

approved

#15 by Vaclav Kotesovec at Fri Sep 27 17:05:33 EDT 2019

FORMULA

a(n) ~ 3^(4*n+2) / (4*Pi*n). - Vaclav Kotesovec, Sep 27 2019

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approved

editing

#14 by Alois P. Heinz at Tue Apr 30 08:51:43 EDT 2019

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proposed

approved

#13 by Seiichi Manyama at Tue Apr 30 08:33:39 EDT 2019

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editing

proposed

#12 by Seiichi Manyama at Tue Apr 30 08:33:35 EDT 2019

LINKS

Seiichi Manyama, <a href="/A307811/b307811.txt">Table of n, a(n) for n = 0..525</a>

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approved

editing

#11 by Susanna Cuyler at Tue Apr 30 08:25:10 EDT 2019

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proposed

approved