A024233 Expansion of tan(tanh(x))*sin(x)/2.

0, 1, -2, -21, 668, -8363, -597350, 76652415, -5349200200, 94006240681, 53961261562294, -13137846911653101, 1863043894828247636, -101535637135541768963, -32156707726436068717742

Offset

0,3

Links

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

Mathematica

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

Crossrefs

Cf. A009717.

Sequence in context: A060319 A095224 A034984 * A015209 A342267 A113083

Adjacent sequences: A024230 A024231 A024232 * A024234 A024235 A024236

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs Mar 1997

Status

approved