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 A009494 Expansion of e.g.f. sin(sinh(x))/cos(x), odd powers only. 1
 1, 3, 17, 203, 5473, 254067, 16540721, 1419027899, 156472224961, 21673957780323, 3688273509233489, 756324514461534251, 183915828663739402273, 52326057512851162076883, 17220068908254192825659249, 6490500645147038725191540251, 2777808923824765305203681470849 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Robert Israel, Table of n, a(n) for n = 0..241 MAPLE S:=series(sin(sinh(x))/cos(x), x, 51): seq(coeff(S, x, j)*j!, j=1..50, 2); # Robert Israel, Aug 21 2018 MATHEMATICA With[{nn=50}, Take[CoefficientList[Series[Sin[Sinh[x]]/Cos[x], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 04 2012 *) PROG (MAGMA) m:=40; R:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(1+Sin(Sinh(x))/Cos(x))); [Factorial(n-1)*b[n]: n in [2..m by 2]]; // Vincenzo Librandi, Aug 22 2018 CROSSREFS Sequence in context: A335343 A133991 A210898 * A267659 A075271 A194925 Adjacent sequences:  A009491 A009492 A009493 * A009495 A009496 A009497 KEYWORD nonn AUTHOR EXTENSIONS Extended and signs tested by Olivier Gérard, Mar 15 1997 More terms from Harvey P. Dale, Dec 04 2012 STATUS approved

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Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)