A009428 Expansion of e.g.f. log(1+x)/cos(tanh(x)).

0, 1, -1, 5, -12, 29, -165, 993, -7056, 62649, -540225, 5044445, -56372844, 685980437, -8868937077, 124034330553, -1855540686720, 29570974192753, -502444027531233, 9041323571823925, -171561171727515820, 3427632445624110605

Offset

0,4

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Mathematica

With[{nn=30}, CoefficientList[Series[Log[1+x]/Cos[Tanh[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Oct 06 2011 *)

Crossrefs

Sequence in context: A069306 A277088 A009412 * A220029 A192520 A094125

Adjacent sequences: A009425 A009426 A009427 * A009429 A009430 A009431

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Corrected Mathematica program, Harvey P. Dale, Oct 06 2011

Status

approved