A013139 - OEIS

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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...

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.)