The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A007980 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A007980

Expansion of (1+x^2)/((1-x)^2*(1-x^3)).
(history; published version)

#166 by Amiram Eldar at Mon Mar 18 07:43:41 EDT 2024

STATUS

reviewed

approved

#165 by Joerg Arndt at Mon Mar 18 03:01:09 EDT 2024

STATUS

proposed

reviewed

#164 by Michel Marcus at Mon Mar 18 02:53:29 EDT 2024

STATUS

editing

proposed

#163 by Michel Marcus at Mon Mar 18 02:53:23 EDT 2024

LINKS

Raghavendra N. Bhat, Cristian Cobeli, and Alexandru Zaharescu, <a href="https://arxiv.org/abs/2403.10500">A lozenge triangulation of the plane with integers</a>, arXiv:2403.10500 [math.NT], 2024.

Mohamed Laradji, Marni Mishna, and Karen Yeats, <a href="https://arxiv.org/abs/1904.06923">Some results on double triangle descendants of K_5</a>, arXiv:1904.06923 [math.CO], 2019.

STATUS

approved

editing

#162 by Hugo Pfoertner at Sat May 20 04:29:41 EDT 2023

STATUS

reviewed

approved

#161 by Joerg Arndt at Sat May 20 04:19:20 EDT 2023

STATUS

proposed

reviewed

#160 by Amiram Eldar at Sat May 20 03:36:01 EDT 2023

STATUS

editing

proposed

#159 by Amiram Eldar at Sat May 20 03:06:31 EDT 2023

LINKS

<a href="/index/Mo#Molien">Index entries for Molien series</a>.

#158 by Amiram Eldar at Sat May 20 03:06:13 EDT 2023

LINKS

Anton Zakharov, <a href="/A007980/a007980.jpg">cevians</a>.

<a href="/index/Mo#Molien">Index entries for Molien series</a>.

<a href="/index/Tu#2wis">Index entries for two-way infinite sequences</a>.

#157 by Amiram Eldar at Sat May 20 03:05:25 EDT 2023

FORMULA

Sum_{n>=0} 1/a(n) = (tanh(Pi/(2*sqrt(3)))-1)*Pi/sqrt(3) + 3. - Amiram Eldar, May 20 2023

STATUS

approved

editing