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A013327 Expansion of e.g.f.: exp(exp(x)-sec(x))=1+x+1/2!*x^2+2/3!*x^3+1/4!*x^4-8/5!*x^5... 0
1, 1, 1, 2, 1, -8, -83, -572, -3447, -21672, -123111, -737240, -3483619, -13031484, 70815357, 2064032844, 35771746481, 493920403632, 6641490804273, 85856649793936, 1103675761610485, 14215393325698588 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Exp[Exp[x]-Sec[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 20 2015 *)

CROSSREFS

Sequence in context: A079899 A239444 A224090 * A009349 A230582 A011186

Adjacent sequences:  A013324 A013325 A013326 * A013328 A013329 A013330

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition clarified by Harvey P. Dale, Dec 20 2015

STATUS

approved

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Last modified August 16 21:46 EDT 2018. Contains 313809 sequences. (Running on oeis4.)