0,2

2x/(1+e^(2x)) = 1 - 2x + 8/4!*x^4 - 96/6!*x^6 + 2176/8!*x^8...

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

Cf. A009725, A065619.

Cf. A099028.

Sequence in context: A087540 A052713 A136797 this_sequence A137704 A001417 A156926

Adjacent sequences: A009749 A009750 A009751 this_sequence A009753 A009754 A009755

nonn

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

Extended and signs tested Mar 15 1997 by Olivier Gerard.