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Search: id:A013447
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A013447 sec(tan(x)-arctan(x))=1+160/6!*x^6-1792/8!*x^8+484224/10!*x^10... +0
1
1, 0, 0, 160, -1792, 484224, -15071232, 6570936320, -461050544128, 285431558799360, -41198126773469184, 31834693166688370688, -8575650915562515595264, 7808988993818084822220800 (list; graph; listen)
OFFSET

0,4
CROSSREFS

Sequence in context: A133530 A120103 A127409 this_sequence A013446 A013444 A013448

Adjacent sequences: A013444 A013445 A013446 this_sequence A013448 A013449 A013450

KEYWORD

sign

AUTHOR

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

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Last modified August 29 14:50 EDT 2008. Contains 143238 sequences.

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