A012133 - OEIS

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A012133

sech(arcsin(tanh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8369/8!*x^8...

1, -1, 9, -201, 8369, -559601, 54852729, -7411089401, 1320161221089, -299803443573601, 84543945702681449, -28984920596097196201, 11872728882101557841809, -5726623333843769342341201 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..13.`
	CROSSREFS	`Sequence in context: A052145 A012061 A012168 * A012038 A012108 A103914` `Adjacent sequences: A012130 A012131 A012132 * A012134 A012135 A012136`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (patrick.demichel(AT)hp.com)`
	STATUS	`approved`

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Last modified May 21 15:07 EDT 2013. Contains 225504 sequences.