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Search: id:A012109
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A012109 sec(arcsin(sinh(x)))=1+1/2!*x^2+13/4!*x^4+421/6!*x^6+26713/8!*x^8... +0
1
1, 1, 13, 421, 26713, 2794441, 436186213, 95033434861, 27555582190513, 10260037095841681, 4771143086720391613, 2710025439753915534901, 1846296024220715321941513, 1486014763274444231870834521 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A081442 A100872 A012045 this_sequence A012084 A114759 A012832

Adjacent sequences: A012106 A012107 A012108 this_sequence A012110 A012111 A012112

KEYWORD

nonn

AUTHOR

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

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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