The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A000825

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

A000825

Expansion of cos x (1 + sin x ) /cos 2x.
(history; published version)

#18 by Alois P. Heinz at Sat Dec 30 14:44:23 EST 2017

STATUS

proposed

approved

#17 by Andrew Howroyd at Sat Dec 30 13:33:53 EST 2017

STATUS

editing

proposed

#16 by Andrew Howroyd at Sat Dec 30 12:46:20 EST 2017

LINKS

R. J. Mathar, <a href="/A000825/b000825.txt">Table of n, a(n) for n = 10..200</a>

AUTHOR

N. J. A. Sloane.

STATUS

approved

editing

Discussion

Sat Dec 30

13:33

Andrew Howroyd: Bfile link text has different range to actual bfile contents, (actual bfile offset confirmed consistent with data).

#15 by Vaclav Kotesovec at Mon Jun 01 08:21:13 EDT 2015

STATUS

editing

approved

#14 by Vaclav Kotesovec at Mon Jun 01 08:21:08 EDT 2015

FORMULA

a(n) ~ n! * (sqrt(2) + 1 + (sqrt(2)-1)*(-1)^n) * 4^n / Pi^(n+1). - Vaclav Kotesovec, Jun 01 2015

STATUS

approved

editing

#13 by Harvey P. Dale at Fri Nov 08 08:17:48 EST 2013

STATUS

editing

approved

#12 by Harvey P. Dale at Fri Nov 08 08:17:42 EST 2013

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Cos[x] (1+Sin[x])/Cos[2x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Nov 08 2013 *)

STATUS

approved

editing

#11 by Russ Cox at Fri Mar 30 16:42:40 EDT 2012

AUTHOR

_N. J. A. Sloane (njas(AT)research.att.com)_.

Discussion

Fri Mar 30

16:42

OEIS Server: https://oeis.org/edit/global/110

#10 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

R. J. Mathar, <a href="/A000825/b000825.txt">Table of n, a(n) for n = 1..200</a>

KEYWORD

nonn,new

nonn

#9 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

LINKS

R. J. Mathar, <a href="http://www.research.att.com/~njas/sequences/b000825.txt">Table of n, a(n) for n = 1..200</a>

KEYWORD

nonn,new

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).