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Search: id:A013007
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A013007 sec(arctan(x)+tan(x))=1+4/2!*x^2+80/4!*x^4+4384/6!*x^6+436992/8!*x^8... +0
1
1, 4, 80, 4384, 436992, 70425984, 16592126976, 5395435991040, 2312302178205696, 1263775007737085952, 857643638399523454976, 707659940568946007474176, 697634806106676807565574144 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A013090 A012042 A013139 this_sequence A013008 A013180 A000316

Adjacent sequences: A013004 A013005 A013006 this_sequence A013008 A013009 A013010

KEYWORD

nonn

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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