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A012658 sech(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, -2240, -56448, 607320, -1834800, 23242824, -229079136, -4388159776, 77755073760, -443094745600, 10064071501184, -151026375297216, -1331806005060480, 38225434479768448 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A099321 A097302 A075367 * A012407 A009093 A012400

Adjacent sequences:  A012655 A012656 A012657 * A012659 A012660 A012661

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 25 11:13 EDT 2021. Contains 348246 sequences. (Running on oeis4.)