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A013320 sec(exp(x)-cos(x))=1+1/2!*x^2+6/3!*x^3+21/4!*x^4+120/5!*x^5... 0
1, 0, 1, 6, 21, 120, 1077, 8918, 83097, 952560, 11790649, 156839430, 2318954253, 37207496040, 637980683277, 11745733936022, 231142374081009, 4825295491430880, 106636356923768497, 2489165244414184326 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A009253 A251593 A012840 * A056308 A081077 A093775

Adjacent sequences:  A013317 A013318 A013319 * A013321 A013322 A013323

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified July 7 12:47 EDT 2022. Contains 355148 sequences. (Running on oeis4.)