0,3

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

A009700.

Sequence in context: A123057 A009072 A002897 this_sequence A009106 A000442 A115964

Adjacent sequences: A024286 A024287 A024288 this_sequence A024290 A024291 A024292

nonn

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

Extended and signs tested 03/97.