A012768 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A012768

exp(cosh(x)*arctan(x))=1+x+1/2!*x^2+2/3!*x^3+5/4!*x^4+20/5!*x^5...

1, 1, 1, 2, 5, 20, 85, 16, -887, 14096, 145865, -887456, -14963507, 126998976, 2554796829, -21834514688, -556819358703, 5067177011456, 157094249035537, -1485621376751104, -55286734778859115

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..20.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Exp[Cosh[x]ArcTan[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Oct 07 2012 *)

CROSSREFS

Sequence in context: A286284 A286285 A192101 * A170947 A006228 A363140

Adjacent sequences: A012765 A012766 A012767 * A012769 A012770 A012771

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved