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A013490 E.g.f.: exp(sinh(x)-tanh(x))=1+3/3!*x^3-15/5!*x^5+90/6!*x^6+273/7!*x^7... 0
1, 0, 0, 3, 0, -15, 90, 273, -2520, -375, 126630, -269907, -7232940, 44118165, 525494970, -6182721087, -41497943760, 965945373105, 2901128941710, -171088458444267, 81569169583020, 34527329266886445 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Exp[Sinh[x]-Tanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 08 2013 *)

CROSSREFS

Sequence in context: A303232 A086479 A091000 * A013351 A013407 A013494

Adjacent sequences:  A013487 A013488 A013489 * A013491 A013492 A013493

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition clarified by Harvey P. Dale, Dec 08 2013

STATUS

approved

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Last modified October 22 18:11 EDT 2021. Contains 348175 sequences. (Running on oeis4.)