id:A012239 - OEIS Search Results

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sech(arctan(atanh(x)))=1-1/2!*x^2+5/4!*x^4-109/6!*x^6+2729/8!*x^8...

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1, -1, 5, -109, 2729, -196281, 9832173, -1827291621, 102520239057, -58512018759921, -121510420621227, -5298654687807230685, -895543588646311726215, -1180050438628226991259305 (list; graph; listen)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A139971 A128110 A142510 this_sequence A012121 A014180 A012122` `Adjacent sequences: A012236 A012237 A012238 this_sequence A012240 A012241 A012242`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research