id:A102075 - OEIS Search Results

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A102075

Expansion of sec(artanh(x)).

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1, 1, 13, 445, 28985, 3061625, 476598725, 102580436725, 29164947696625, 10583881430448625, 4773158983014768125, 2618414864448579438125, 1716782830141547577475625, 1325775140076807694645515625 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`sec(artanh(x)) = 1 + x^2/2 + 13x^4/4! + 445x^6/6! + 28985x^8/8! +...` `sech(arctan(x)) = 1 - x^2/2 + 13x^4/4! - 445x^6/6! + 28985x^8/8! -...`
	CROSSREFS	`Sequence in context: A012084 A114759 A012832 this_sequence A081862 A012073 A012143` `Adjacent sequences: A102072 A102073 A102074 this_sequence A102076 A102077 A102078`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Dec 31 2004`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

AT&T Labs Research