A012517 Expansion of e.g.f.: sec(sinh(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+450/6!*x^6-2940/7!*x^7...

1, 0, 0, 0, 12, -60, 450, -2940, 30800, -336672, 4362120, -57707760, 847204776, -13292039904, 228041125312, -4172767915680, 81658781501440, -1692115320051584, 37160192133050304, -860809698597753216

Offset

0,5

Links

Table of n, a(n) for n=0..19.

Mathematica

With[{nn=20}, CoefficientList[Series[Sec[Sinh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Feb 13 2022 *)

Crossrefs

Sequence in context: A012308 A009154 A012313 * A012314 A233004 A012360

Adjacent sequences: A012514 A012515 A012516 * A012518 A012519 A012520

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Extensions

Definition clarified by Harvey P. Dale, Feb 13 2022

Status

approved