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Search: id:A012061
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A012061 sec(sin(arctanh(x)))=1+1/2!*x^2+9/4!*x^4+201/6!*x^6+7921/8!*x^8... +0
1
1, 1, 9, 201, 7921, 447281, 28121145, 230243001, -940995291295, -539358796035359, -280768914546419735, -156059839698555664599, -96215805882840361663151, -66431831409927100446899439 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A064756 A093708 A052145 this_sequence A012168 A012133 A012038

Adjacent sequences: A012058 A012059 A012060 this_sequence A012062 A012063 A012064

KEYWORD

sign

AUTHOR

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

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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