id:A012169 - OEIS Search Results

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sech(tan(arcsinh(x)))=1-1/2!*x^2+1/4!*x^4-1/6!*x^6+449/8!*x^8...

+0
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1, -1, 1, -1, 449, -31681, 3077185, -445157441, 87981830785, -22627780368001, 7353703042163585, -2948527179059299201, 1429774747400938052161, -824792570907860638058561, 558247886671770078618138049 (list; graph; listen)

	OFFSET	`0,5`
	CROSSREFS	`Adjacent sequences: A012166 A012167 A012168 this_sequence A012170 A012171 A012172` `Sequence in context: A105376 A135073 A036945 this_sequence A093402 A012062 A079659`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research