A024285 - OEIS

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A024285

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

0, 1, -8, 144, -5184, 305152, -26442752, 3162378240, -498850234368, 100338708840448, -25063296518586368, 7611477148997517312, -2761834207318131081216, 1180050998603017168617472

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

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

CROSSREFS

Cf. A009795.

Sequence in context: A052764 A341957 A024284 * A111687 A231851 A071305

Adjacent sequences: A024282 A024283 A024284 * A024286 A024287 A024288

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

STATUS

approved