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Search: id:A012153
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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, 1, 21, 1053, 96905, 14216409, 3045819741, 897606889013, 348348521840273, 172224469448231985, 105685328498514238501, 78822199814116989651661, 70223663543654715642543129, 73659278933239564262294052361 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A004704 A138473 A072678 this_sequence A143003 A012183 A012230

Adjacent sequences: A012150 A012151 A012152 this_sequence A012154 A012155 A012156

KEYWORD

nonn

AUTHOR

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

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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