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A012878 E.g.f.: exp(sech(x)*arcsin(x))=1+x+1/2!*x^2-1/3!*x^3-7/4!*x^4+5/5!*x^5... 0
1, 1, 1, -1, -7, 5, 145, 499, -2063, -12055, 128705, 2156871, 5154217, -24423763, 510686033, 27205910523, 254809389793, 2396435716433, 27371394484993, 1214149548475407, 18728499608356185, 375616253471952085 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Exp[Sech[x]ArcSin[x]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Mar 25 2013 *)

CROSSREFS

Sequence in context: A294474 A248277 A002019 * A300452 A302201 A263171

Adjacent sequences:  A012875 A012876 A012877 * A012879 A012880 A012881

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition (Name) clarified by Harvey P. Dale, Mar 25 2013

STATUS

approved

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Last modified July 26 10:21 EDT 2021. Contains 346294 sequences. (Running on oeis4.)