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Search: id:A012813
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A012813 sech(sec(x)*arctan(x))=1-1/2!*x^2+1/4!*x^4-145/6!*x^6+6977/8!*x^8... +0
1
1, -1, 1, -145, 6977, -568865, 80708417, -14347965489, 3496685652353, -1086579978065473, 419435785375158145, -197705949756543164369, 111488102700546889037505, -74151248251988209281143905 (list; graph; listen)
OFFSET

0,4
CROSSREFS

Sequence in context: A031600 A008377 A076464 this_sequence A018232 A097730 A060720

Adjacent sequences: A012810 A012811 A012812 this_sequence A012814 A012815 A012816

KEYWORD

sign

AUTHOR

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

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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