id:A012393 - OEIS Search Results

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arctanh(tan(x)*tan(x))=2/2!*x^2+16/4!*x^4+512/6!*x^6+34816/8!*x^8...

+0
3

2, 16, 512, 34816, 4063232, 724566016, 183240753152, 62382319599616, 27507470234550272, 15250953398036463616, 10384044045105304174592, 8517992937742473694806016, 8285310016381680852100186112 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`E.g.f.: ln(sec(2*x))/2, cf. A000182. - Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 04 2005`
	CROSSREFS	`Sequence in context: A140311 A012389 A009710 this_sequence A063387 A063391 A002416` `Adjacent sequences: A012390 A012391 A012392 this_sequence A012394 A012395 A012396`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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