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A009791
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E.g.f. tanh(sin(sin(x))) (odd powers only).
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1
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1, -4, 68, -2584, 171344, -17464448, 2529148352, -493428887168, 124730546544896, -39649824402078720, 15479590269182063616, -7280988095409621465088, 4060943278418110382329856, -2650034901967494261760065536
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OFFSET
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0,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..100
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EXAMPLE
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tanh(sin(sin(x))) = x - 4/3!*x^3 + 68/5!*x^5 - 2584/7!*x^7 +- ...
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[Sin[Sin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Apr 17 2014 *)
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CROSSREFS
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Sequence in context: A302115 A009473 A009520 * A012484 A174809 A125587
Adjacent sequences: A009788 A009789 A009790 * A009792 A009793 A009794
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
Prior Mathematica program replaced by Harvey P. Dale, Apr 17 2014
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STATUS
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approved
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