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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
CROSSREFS
Sequence in context: A075367 A359419 A372135 * A012407 A009093 A012400
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified May 28 19:55 EDT 2024. Contains 372919 sequences. (Running on oeis4.)