0,2

(tan x)^2 = x^2 + 2/3*x^4 + 17/45*x^6 + 62/315*x^8 + ...

Tan[ x ]^2 (* Even Part *)

Essentially same as A000182.

Cf. A024283, A000182.

Adjacent sequences: A009761 A009762 A009763 this_sequence A009765 A009766 A009767

Sequence in context: A090305 A050974 A012188 this_sequence A000182 A102599 A123744

nonn,easy

R. H. Hardin (rhhardin(AT)att.net)

Extended and signs tested Mar 15 1997 by Olivier Gerard.