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A012553 sech(sinh(x)*tan(x))=1-12/4!*x^4-360/6!*x^6-4592/8!*x^8... 0
1, 0, -12, -360, -4592, 866880, 144205248, 10276506240, -1972062209792, -1066588240250880, -219129099375885312, 33054966279836497920, 54554661987210721497088, 24677742880461438548951040 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A053068 A046969 A074094 * A128043 A012431 A012386

Adjacent sequences:  A012550 A012551 A012552 * A012554 A012555 A012556

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 4 19:10 EDT 2022. Contains 357239 sequences. (Running on oeis4.)