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Search: id:A012455
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A012455 sech(arctan(x)*tan(x))=1-12/4!*x^4-560/8!*x^8+241920/10!*x^10... +0
1
1, 0, -12, 0, -560, 241920, -8750016, 1727165440, -426305201920, 91939471712256, -31563179893517312, 13087008599986241536, -6237304648085400498176, 3651782585501269235793920 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A077351 A119530 A012332 this_sequence A120954 A012337 A012339

Adjacent sequences: A012452 A012453 A012454 this_sequence A012456 A012457 A012458

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified July 19 08:04 EDT 2008. Contains 142098 sequences.

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