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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... 0
1, 0, 0, 0, 12, -60, 450, -2940, 30800, -336672, 4362120, -57707760, 847204776, -13292039904, 228041125312, -4172767915680, 81658781501440, -1692115320051584, 37160192133050304, -860809698597753216 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 30 18:15 EDT 2022. Contains 354945 sequences. (Running on oeis4.)