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Search: id:A013515
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A013515 sech(sec(x)-sech(x))=1-12/4!*x^4+1568/8!*x^8+6840768/12!*x^12... +0
1
1, -12, 1568, 6840768, -41485549312, -616649036623872, 51689032519042469888, 309411873154808535072768 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A160237 A012870 A013474 this_sequence A159383 A015011 A034280

Adjacent sequences: A013512 A013513 A013514 this_sequence A013516 A013517 A013518

KEYWORD

sign

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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