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A012303 sech(sin(x)*sin(x))=1-12/4!*x^4+240/6!*x^6+4368/8!*x^8... 0
1, 0, -12, 240, 4368, -942720, 42639168, 8638506240, -2287049555712, 38746394603520, 145600412857955328, -42974022434701332480, -7760313189299657306112, 11863589839842518338928640 (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: A012544 A009052 A213449 * A119837 A012538 A006588

Adjacent sequences:  A012300 A012301 A012302 * A012304 A012305 A012306

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 22 11:23 EDT 2018. Contains 316438 sequences. (Running on oeis4.)