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Search: id:A012840
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A012840 exp(sec(x)*arctanh(x))=1+x+1/2!*x^2+6/3!*x^3+21/4!*x^4+120/5!*x^5... +0
1
1, 1, 1, 6, 21, 120, 765, 5376, 46473, 415104, 4371225, 48143744, 594635613, 7784817664, 110691178325, 1673986906112, 27018807872657, 462531126525952, 8370279766396593, 159859054841331712 (list; graph; listen)
OFFSET

0,4
CROSSREFS

Adjacent sequences: A012837 A012838 A012839 this_sequence A012841 A012842 A012843

Sequence in context: A060843 A026650 A009253 this_sequence A013320 A056308 A081077

KEYWORD

nonn

AUTHOR

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

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Last modified May 8 18:01 EDT 2008. Contains 139605 sequences.

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