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Search: id:A012144
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A012144 sec(arcsin(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+769/6!*x^6+66849/8!*x^8... +0
1
1, 1, 17, 769, 66849, 9506241, 2007271089, 589807203777, 230194642564161, 115219444193968257, 71962921603647030609, 54865853223458268869505, 50151129904368572197783905, 54139213630083955379966633025 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A128274 A012085 A012221 this_sequence A139091 A124235 A086265

Adjacent sequences: A012141 A012142 A012143 this_sequence A012145 A012146 A012147

KEYWORD

nonn

AUTHOR

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

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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.

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