OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..100
FORMULA
a(n) = (2*n)! * [x^(2*n)] cosh(sin(x)^2).
MAPLE
a:= n-> coeff(series(cosh(sin(x)^2), x, 2*n+1), x, 2*n)*(2*n)!:
seq ( a(n), n=0..20); # Alois P. Heinz, Aug 15 2012
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Cosh[Sin[x]^2], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 15 2012 *)
CROSSREFS
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
More terms from, and definition clarified by, Harvey P. Dale, Aug 15 2012
STATUS
approved