A024296 E.g.f.: log(1+tan(x)*sinh(x))/2 (even powers only).

0, 1, 0, 11, 140, 2701, 257730, 5851691, 1344070520, 73317675481, 17125877112510, 2314602290490071, 496897093852087700, 132852776453477111461, 31592203753748083380090, 12724021149804296273555651, 3989248533415441473207453680, 1975896027212299978047797438641

Offset

0,4

Links

Table of n, a(n) for n=0..17.

Example

log(1+tan(x)*sinh(x))/2 = 0 + 1/2!*x^2 + 0/4!*x^4 + 11/6!*x^6 + 140/8!*x^8 + ...

Mathematica

With[{nn=40}, Take[CoefficientList[Series[Log[1+Tan[x]Sinh[x]]/2, {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Mar 11 2013 *)

Crossrefs

A009378.

Sequence in context: A003378 A142930 A024142 * A324084 A141907 A205084

Adjacent sequences: A024293 A024294 A024295 * A024297 A024298 A024299

Keyword

nonn

Author

R. H. Hardin

Extensions

Extended and signs tested 03/97.

More terms from Harvey P. Dale, Mar 11 2013

Status

approved