id:A102063 - OEIS Search Results

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A102063

Expansion of tan(atanh(x)).

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1, 4, 80, 3680, 300800, 38233600, 6960179200, 1715803648000, 549927772160000, 222172054667264000, 110418310176112640000, 66193620737183580160000, 47093975714823012352000000 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`With alternating signs, expansion of tanh(atan(x)).`
	EXAMPLE	`tan(atanh(x)) = x + 4x^2/2 + 80x^4/4! + 3680x^6/6! + 300800x^8/8! +..`
	CROSSREFS	`Sequence in context: A057875 A012824 A012057 this_sequence A002436 A013031 A012923` `Adjacent sequences: A102060 A102061 A102062 this_sequence A102064 A102065 A102066`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Dec 28 2004`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research