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Search: id:A012686
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A012686 sec(tanh(x)*arctan(x))=1+12/4!*x^4-480/6!*x^6+35280/8!*x^8... +0
1
1, 0, 12, -480, 35280, -4208640, 737643456, -178203637248, 56744323733760, -23028982493429760, 11602867906455268352, -7105927543880909185024, 5198792960623369943994368, -4478214849312972324010721280 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A012685 A012465 A012394 this_sequence A012466 A004801 A067733

Adjacent sequences: A012683 A012684 A012685 this_sequence A012687 A012688 A012689

KEYWORD

sign

AUTHOR

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

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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