A012193 - OEIS

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A012193

sech(arctan(sin(x)))=1-1/2!*x^2+17/4!*x^4-721/6!*x^6+58337/8!*x^8...

1, -1, 17, -721, 58337, -7657441, 1482169457, -396854618161, 140415423261377, -63432792091634881, 35619694647751942097, -24334169873267896659601, 19872330538404158435859617 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A201311 A012182 A012029 * A128274 A012085 A171766` `Adjacent sequences: A012190 A012191 A012192 * A012194 A012195 A012196`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 14 02:58 EST 2012. Contains 205567 sequences.