A013125 Expansion of E.g.f.: tanh(tanh(x)+log(x+1))=2*x-1/2!*x^2-16/3!*x^3+42/4!*x^4+492/5!*x^5...

0, 2, -1, -16, 42, 492, -3210, -30168, 404264, 2783952, -75206520, -292604288, 19217701008, 3111794272, -6389076941520, 29520888356032, 2643629755167360, -29037077579992832, -1307061634619873664

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Mathematica

With[{nn=20}, CoefficientList[Series[Tanh[Tanh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 27 2018 *)

Crossrefs

Sequence in context: A381670 A162005 A325220 * A012967 A013121 A012963

Adjacent sequences: A013122 A013123 A013124 * A013126 A013127 A013128

Keyword

sign

Author

Patrick Demichel

Extensions

Zero prepended and definition clarified by Harvey P. Dale, May 27 2018

Status

approved