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A009220
Sum(a(n)*x^n/n!) = exp(sinh(sinh(x))).
0
1, 1, 1, 3, 9, 33, 153, 731, 4273, 25857, 177489, 1311379, 10342137, 89060065, 800697641, 7778778091, 78896218081, 849264442881, 9587206592289, 113234181108643, 1403875965476969, 18073465545032353, 243412313149166137, 3395124358886313595, 49273184499900888465
OFFSET
0,4
FORMULA
E.g.f.: exp(sinh(sinh(x))).
MATHEMATICA
Exp[ Sinh[ Sinh[ x ] ] ]
PROG
(PARI) vector(#t=Vec(exp(sinh(sinh(x)))), n, t[n]*(n-1)!) \\ M. F. Hasler, Jan 12 2013
CROSSREFS
Sequence in context: A376269 A180632 A279840 * A294035 A374347 A007489
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Extended and signs checked by Olivier Gérard, Mar 15 1997.
Better definition by M. F. Hasler, Jan 12 2013
STATUS
approved