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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, 17, 769, 66849, 9506241, 2007271089, 589807203777, 230194642564161, 115219444193968257, 71962921603647030609, 54865853223458268869505, 50151129904368572197783905, 54139213630083955379966633025 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A294757 A176233 A012221 * A265190 A308490 A249459

Adjacent sequences:  A012141 A012142 A012143 * A012145 A012146 A012147

KEYWORD

nonn

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified October 21 02:29 EDT 2021. Contains 348141 sequences. (Running on oeis4.)