A012553 sech(sinh(x)*tan(x))=1-12/4!*x^4-360/6!*x^6-4592/8!*x^8...

1, 0, -12, -360, -4592, 866880, 144205248, 10276506240, -1972062209792, -1066588240250880, -219129099375885312, 33054966279836497920, 54554661987210721497088, 24677742880461438548951040

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