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A013139 sec(tanh(x)+tan(x))=1+4/2!*x^2+80/4!*x^4+4288/6!*x^6+426240/8!*x^8... 0
1, 4, 80, 4288, 426240, 67920896, 15873495040, 5113806962688, 2172417489305600, 1176644688113041408, 791421023406538096640, 647183647775891247857664, 632330839348840678513704960 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A012922 A013090 A012042 * A013007 A013008 A013180

Adjacent sequences: A013136 A013137 A013138 * A013140 A013141 A013142

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified January 29 04:38 EST 2023. Contains 359915 sequences. (Running on oeis4.)