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A012034
exp(sin(arcsinh(x))) = 1+x+1/2!*x^2-1/3!*x^3-7/4!*x^4+1/5!*x^5...
0
1, 1, 1, -1, -7, 1, 121, 111, -4271, -9407, 262801, 957791, -25257079, -131065791, 3510517193, 23876150351, -667413187039, -5645293077119, 166471455235489, 1689130316350143, -52750545434135399
OFFSET
0,5
FORMULA
a(n) ~ 2 * n^(n-1) * cosh(Pi/2) * sin(Pi*n/2-sinh(Pi/2)) / exp(n). - Vaclav Kotesovec, Oct 30 2013
MATHEMATICA
CoefficientList[Series[Exp[Sin[ArcSinh[x]]], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Oct 30 2013 *)
CROSSREFS
Sequence in context: A013559 A051186 A373389 * A138324 A052122 A027538
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved