OFFSET
0,1
LINKS
Robert Israel, Table of n, a(n) for n = 0..223
FORMULA
Sum_{n>=0} a(n) x^(2*n+2)/(2*n+2)! = sin(arctan(x)^2). - Robert Israel, Apr 04 2016
MAPLE
S:= series(g, x, 52):
seq(coeff(S, x, 2*j)*(2*j)!, j=1..25); # Robert Israel, Apr 04 2016
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTan[x]^2], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Aug 20 2014 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, Aug 20 2014
STATUS
approved