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A012708
Expansion of e.g.f.: sech(arctanh(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-570/6!*x^6...
0
1, 0, 0, 0, -12, 60, -570, 3780, -29568, 169344, -557160, -13049520, 375064008, -7823848032, 135678667488, -2221166656800, 32120158935552, -397914002426496, 2522488580207424, 61215640433391744
OFFSET
0,5
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Sech[ArcTanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 23 2023 *)
CROSSREFS
Sequence in context: A012314 A233004 A012360 * A009077 A012702 A009163
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, Apr 23 2023
STATUS
approved