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Search: id:A012811
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A012811 cosh(sec(x)*arctan(x))=1+1/2!*x^2+5/4!*x^4+205/6!*x^6+2473/8!*x^8... +0
1
1, 1, 5, 205, 2473, 475385, -2814227, 5900398725, -532397600303, 273302104270705, -68724093821987755, 35776180280496600509, -16339748046588020242311, 10552119508350355540652905 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A137736 A157389 A128678 this_sequence A060486 A002438 A005333

Adjacent sequences: A012808 A012809 A012810 this_sequence A012812 A012813 A012814

KEYWORD

sign

AUTHOR

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

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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