

A009791


E.g.f. tanh(sin(sin(x))) (odd powers only).


1



1, 4, 68, 2584, 171344, 17464448, 2529148352, 493428887168, 124730546544896, 39649824402078720, 15479590269182063616, 7280988095409621465088, 4060943278418110382329856, 2650034901967494261760065536
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OFFSET

0,2


LINKS



EXAMPLE

tanh(sin(sin(x))) = x  4/3!*x^3 + 68/5!*x^5  2584/7!*x^7 + ...


MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[Sin[Sin[x]]], {x, 0, nn}], x] Range[0, nn1]!, {2, 1, 2}]] (* Harvey P. Dale, Apr 17 2014 *)


CROSSREFS



KEYWORD

sign


AUTHOR



EXTENSIONS



STATUS

approved



