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A009675
Tan(sin(x)^2) = 2/2!*x^2 - 8/4!*x^4 + 272/6!*x^6 - 13568/8!*x^8 + ...
3
0, 2, -8, 272, -13568, 1048832, -128073728, 21002749952, -4567924441088, 1269483920556032, -437557299535413248, 183472013004069404672, -91918408815486181572608, 54224850406884797340188672
OFFSET
0,2
LINKS
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
Cf. A024264.
Sequence in context: A203317 A258161 A012296 * A012301 A296406 A215651
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved