OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..100
FORMULA
a(n) = (2*n)! * [x^(2*n)] tan(sin(x)^2)/2.
a(n) ~ (2*n)! * (-1)^(n+1) / (sqrt(Pi*(2+Pi)) * (log(sqrt(Pi/2) + sqrt(1 + Pi/2)))^(2*n+1)). - Vaclav Kotesovec, Feb 04 2015
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tan[Sin[x]^2]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jan 30 2013 *)
CROSSREFS
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs Mar 1997
STATUS
approved