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Search: id:A013008
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A013008 sech(arctan(x)+tan(x))=1-4/2!*x^2+80/4!*x^4-4384/6!*x^6+451328/8!*x^8... +0
1
1, -4, 80, -4384, 451328, -74726784, 18162914304, -6087614197760, 2690808196562944, -1516485688823611392, 1061352718471077658624, -903110171035290053246976, 918161695966849718656434176 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A012042 A013139 A013007 this_sequence A013180 A000316 A012106

Adjacent sequences: A013005 A013006 A013007 this_sequence A013009 A013010 A013011

KEYWORD

sign

AUTHOR

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

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

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