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Search: id:A013139
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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
1, 4, 80, 4288, 426240, 67920896, 15873495040, 5113806962688, 2172417489305600, 1176644688113041408, 791421023406538096640, 647183647775891247857664, 632330839348840678513704960 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A012922 A013090 A012042 this_sequence A013007 A013008 A013180

Adjacent sequences: A013136 A013137 A013138 this_sequence A013140 A013141 A013142

KEYWORD

nonn

AUTHOR

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

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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