The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A012256

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A012256

Expansion of e.g.f.: exp(tanh(arctan(x)))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+41/5!*x^5...
(history; published version)

#6 by Harvey P. Dale at Tue Dec 20 19:02:41 EST 2022

STATUS

editing

approved

#5 by Harvey P. Dale at Tue Dec 20 19:02:38 EST 2022

NAME

Expansion of e.g.f.: exp(tanh(arctan(x)))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+41/5!*x^5...

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Exp[Tanh[ArcTan[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 20 2022 *)

EXTENSIONS

Definition clarified by Harvey P. Dale, Dec 20 2022

STATUS

approved

editing

#4 by Charles R Greathouse IV at Fri Feb 24 12:50:45 EST 2012

AUTHOR

Patrick Demichel (dmlpatrick.demichel(AT)hpfrcu03.france.hp.com)

Discussion

Fri Feb 24

12:50

OEIS Server: https://oeis.org/edit/global/108

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

KEYWORD

sign,done,new

sign

AUTHOR

Patrick Demichel (dml@(AT)hpfrcu03.france.hp.com)

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

REFERENCES

KEYWORD

sign,done,new

#1 by N. J. A. Sloane at Wed Dec 11 03:00:00 EST 1996

NAME

exp(tanh(arctan(x)))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+41/5!*x^5...

DATA

1, 1, 1, -3, -15, 41, 561, -1019, -38623, 12305, 4206881, 7478221, -661302639, -3005647943, 140958927825, 1143787246421, -38921417469119, -494108406644959, 13433349471318337, 250135591701350045

OFFSET

0,4

REFERENCES

KEYWORD

sign,done

AUTHOR

Patrick Demichel ([email protected])

STATUS

approved