A024252 Expansion of tan(x)*tan(tanh(x))/2.

0, 1, 4, 24, 1088, 36352, 1283584, 160269312, 11824283648, 1434982481920, 275376204414976, 40808962274623488, 10384927347565395968, 2724691062936548933632, 799682075020079191293952

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Mathematica

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

Crossrefs

A009751.

Sequence in context: A009043 A024251 A193484 * A368141 A368144 A303131

Adjacent sequences: A024249 A024250 A024251 * A024253 A024254 A024255

Keyword

nonn

Author

R. H. Hardin

Extensions

Extended and signs tested 03/97.

Status

approved