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A012657 E.g.f.: sec(tanh(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+90/6!*x^6-420/7!*x^7... 0
1, 0, 0, 0, 12, -60, 90, -420, 19040, -245952, 1660680, -12025200, 266431176, -5435780064, 74009711776, -910402889760, 17440536006400, -420186078195584, 8609810161550016, -157606804730862720 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
LINKS
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Sec[Tanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 03 2014 *)
CROSSREFS
Sequence in context: A012400 A009172 A012405 * A012406 A097191 A338159
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Definition clarified by Harvey P. Dale, Jun 03 2014
STATUS
approved

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Last modified June 22 22:41 EDT 2024. Contains 373629 sequences. (Running on oeis4.)