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Search: id:A012454
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A012454 sec(arctan(x)*tan(x))=1+12/4!*x^4+17360/8!*x^8-241920/10!*x^10... +0
1
1, 0, 12, 0, 17360, -241920, 186158016, -11413642240, 7726026430720, -1212323504480256, 892608906281741312, -274005660019568705536, 234514059257417538031616, -119571044071522301122641920 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A012448 A012338 A012453 this_sequence A010208 A010209 A058306

Adjacent sequences: A012451 A012452 A012453 this_sequence A012455 A012456 A012457

KEYWORD

sign

AUTHOR

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

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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