The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A152192 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A152192

a(n) = Product_{k=1..floor((n-1)/2)} (1 + 4*cos(2*Pi*k/n)^2).
(history; published version)

#23 by Michel Marcus at Thu Jan 07 04:54:56 EST 2021

STATUS

reviewed

approved

#22 by Joerg Arndt at Thu Jan 07 01:21:59 EST 2021

STATUS

proposed

reviewed

#21 by Michel Marcus at Thu Jan 07 01:12:36 EST 2021

STATUS

editing

proposed

#20 by Michel Marcus at Thu Jan 07 01:12:32 EST 2021

LINKS

<a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,2,0,2,0,-1).

STATUS

proposed

editing

#19 by Jon E. Schoenfield at Wed Jan 06 22:35:25 EST 2021

STATUS

editing

proposed

#18 by Jon E. Schoenfield at Wed Jan 06 22:35:23 EST 2021

NAME

a(n) = prod(Product_{k=1..floor((n-1)/2), } (1 + 4*cos(2*Pi*k/n)^2 ).

COMMENTS

Limit_Lim_{n->infinity} sqrt(a(n+2)/a(n)) = (sqrt(5) + 1)/2.

STATUS

approved

editing

#17 by Charles R Greathouse IV at Sat Jun 13 00:52:44 EDT 2015

LINKS

<a href="/index/Rec">Index to sequences with entries for linear recurrences with constant coefficients</a>, signature (0,2,0,2,0,-1).

Discussion

Sat Jun 13

00:52

OEIS Server: https://oeis.org/edit/global/2439

#16 by Charles R Greathouse IV at Fri Jun 12 15:26:50 EDT 2015

LINKS

<a href="/index/Rea#recLCCRec">Index to sequences with linear recurrences with constant coefficients</a>, signature (0,2,0,2,0,-1).

Discussion

Fri Jun 12

15:26

OEIS Server: https://oeis.org/edit/global/2436

#15 by Bruno Berselli at Wed Apr 16 05:40:54 EDT 2014

STATUS

proposed

approved

#14 by Joerg Arndt at Mon Apr 14 13:41:21 EDT 2014

STATUS

editing

proposed