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Search: id:A012211
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A012211 sech(arctan(atan(x)))=1-1/2!*x^2+21/4!*x^4-1149/6!*x^6+119305/8!*x^8... +0
1
1, -1, 21, -1149, 119305, -20082841, 4984310493, -1711500674389, 776816116717457, -450301381427975089, 324553968807761095973, -284661632752853556677805, 298518404617173649259722905 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Adjacent sequences: A012208 A012209 A012210 this_sequence A012212 A012213 A012214

Sequence in context: A012230 A086098 A086875 this_sequence A036059 A036519 A118446

KEYWORD

sign

AUTHOR

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

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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