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A012418 Expansion of e.g.f.: sec(arctan(x)*exp(x))=1+1/2!*x^2+6/3!*x^3+21/4!*x^4+100/5!*x^5... 0
1, 0, 1, 6, 21, 100, 1005, 9170, 73353, 794952, 11042745, 144625118, 1936131549, 31475441452, 562265168101, 9960214270890, 187956163443857, 3970728871687824, 88040662078595313, 1994667867977462454 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Sec[ArcTan[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 19 2016 *)
CROSSREFS
Sequence in context: A344496 A012773 A012662 * A203295 A318566 A083558
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, Mar 19 2016
STATUS
approved

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Last modified March 19 02:55 EDT 2024. Contains 370952 sequences. (Running on oeis4.)