A024259 Expansion of sinh(tan(x))*sin(x)/2.

0, 1, 4, 84, 2880, 155152, 11947072, 1240929984, 166862665728, 28164532992256, 5825137200342016, 1447885245123609600, 425631502990107721728, 146006164524789598523392, 57780315705196065420230656, 26120433169446248117938667520, 13373554434110899828789859057664

Offset

0,3

Links

Table of n, a(n) for n=0..16.

Formula

a(n) = A009606(n)/2.

Mathematica

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

Crossrefs

Cf. A009606.

Sequence in context: A356504 A270577 A156477 * A357672 A361542 A024260

Adjacent sequences: A024256 A024257 A024258 * A024260 A024261 A024262

Keyword

nonn

Author

R. H. Hardin

Extensions

Extended and signs tested 03/97.

Status

approved