OFFSET
0,2
LINKS
Robert Israel, Table of n, a(n) for n = 0..226
FORMULA
a(n) = 2 * A024264(n).
MAPLE
S:= series(tan(sin(x)^2), x, 101):
seq(coeff(S, x, j)*j!, j=0..100, 2); # Robert Israel, Apr 02 2017
MATHEMATICA
Tan[ Sin[ x ]^2 ] (* Even Part *)
CROSSREFS
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved