A009459 Expansion of sin(log(1+x))/cos(x).

0, 1, -1, 4, -6, 25, 15, -338, 6972, -70891, 859275, -9640864, 120888174, -1541505979, 21347932515, -308351466590, 4764530724600, -77278806586295, 1328450775136695, -23972129893393796, 455516697937247010

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Mathematica

Sin[ Log[ 1+x ] ]/Cos[ x ]
CoefficientList[Series[Sec[x]*Sin[Log[1 + x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 24 2015 *)

Crossrefs

Sequence in context: A241602 A136591 A277997 * A239625 A123055 A272306

Adjacent sequences: A009456 A009457 A009458 * A009460 A009461 A009462

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved