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A012153 sec(tan(tan(x)))=1+1/2!*x^2+21/4!*x^4+1053/6!*x^6+96905/8!*x^8... 0
1, 1, 21, 1053, 96905, 14216409, 3045819741, 897606889013, 348348521840273, 172224469448231985, 105685328498514238501, 78822199814116989651661, 70223663543654715642543129, 73659278933239564262294052361 (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: A263994 A072678 A218821 * A231521 A220637 A143003

Adjacent sequences:  A012150 A012151 A012152 * A012154 A012155 A012156

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified October 21 16:12 EDT 2019. Contains 328301 sequences. (Running on oeis4.)