The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A052912 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A052912

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

#35 by Michel Marcus at Sun Aug 04 05:59:27 EDT 2024

STATUS

reviewed

approved

#34 by Joerg Arndt at Sun Aug 04 01:35:12 EDT 2024

STATUS

proposed

reviewed

#33 by Seiichi Manyama at Sat Aug 03 22:15:33 EDT 2024

STATUS

editing

proposed

Discussion

Sun Aug 04

00:16

Michel Marcus: the floor(n/3) was necessary ?

#32 by Seiichi Manyama at Sat Aug 03 22:15:10 EDT 2024

CROSSREFS

Cf. A000930.

#31 by Seiichi Manyama at Sat Aug 03 22:14:09 EDT 2024

FORMULA

a(n) = Sum_{k=0..floor(n/3)} binomial(n-2*k, k)*2^(n-2*k). - Greg Dresden, Aug 03 2024

STATUS

proposed

editing

#30 by Greg Dresden at Sat Aug 03 20:43:34 EDT 2024

STATUS

editing

proposed

#29 by Greg Dresden at Sat Aug 03 20:42:45 EDT 2024

FORMULA

a(n) = Sum_{k=0..n/3} binomial(n-2*k, k)*2^(n-2*k). - Greg Dresden, Aug 03 2024

STATUS

approved

editing

#28 by Charles R Greathouse IV at Thu Sep 08 08:44:59 EDT 2022

PROG

(MAGMAMagma) R<x>:=PowerSeriesRing(Integers(), 30); Coefficients(R!( 1/(1-2*x-2*x^3) )); // G. C. Greubel, Oct 15 2019

Discussion

Thu Sep 08

08:44

OEIS Server: https://oeis.org/edit/global/2944

#27 by Joerg Arndt at Wed Oct 16 02:03:50 EDT 2019

STATUS

reviewed

approved

#26 by Michel Marcus at Wed Oct 16 00:56:05 EDT 2019

STATUS

proposed

reviewed