The On-Line Encyclopedia of Integer Sequences (OEIS)

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Revision History for A024249

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A024249

Expansion of tanh(tan(x))*tan(x)/2.
(history; published version)

#8 by Harvey P. Dale at Mon Jan 30 12:01:04 EST 2023

STATUS

editing

approved

#7 by Harvey P. Dale at Mon Jan 30 12:01:01 EST 2023

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[ Tan[ x ] ]*Tan[ x ]/2 , {x, 0, nn}], x] Range[ 0, nn]!, {1, -1, 2}]] (* Even Part _Harvey P. Dale_, Jan 30 2023 *)

EXTENSIONS

Previous Mathematica program replaced by Harvey P. Dale, Jan 30 2023

STATUS

approved

editing

#6 by Russ Cox at Sat Mar 31 12:34:58 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net)_

Discussion

Sat Mar 31

12:34

OEIS Server: https://oeis.org/edit/global/875

#5 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

R. H. Hardin (rhhrhhardin(AT)cadenceatt.comnet)

#4 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004

NAME

Expansion of tanh(tan(x)).*tan(x)/2.

KEYWORD

nonn,new

nonn

#3 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

KEYWORD

nonn,new

nonn

AUTHOR

R. H. Hardin (rhh@research.att(AT)cadence.com)

#2 by N. J. A. Sloane at Sat Dec 11 03:00:00 EST 1999

NAME

Expansion of tanh(tan(x)).tan(x)/2.

DATA

0, 1, 4, 24, 192, 9472, 1182208, 135668736, 14993473536, 1702145425408, 212302947942400, 32402586267549696, 6715751146400514048, 1845064263947813650432, 597912413872386432040960

OFFSET

0,23

MATHEMATICA

Tanh[ Tan[ x ] ]*Tan[ x ]/2 (* Even Part *)

CROSSREFS

A009812.

KEYWORD

,new

nonn

EXTENSIONS

Extended and signs tested 03/97.

#1 by N. J. A. Sloane at Sun Jun 14 03:00:00 EDT 1998

NAME

Expansion of tanh(tan(x)).tan(x).

DATA

1, 4, 24, 192, 9472, 1182208, 135668736, 14993473536, 1702145425408, 212302947942400, 32402586267549696, 6715751146400514048, 1845064263947813650432

OFFSET

0,2

REFERENCES

AUTHOR

rhh@research.att.com

STATUS

approved