A012670 - OEIS

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A012670

arctan(tanh(x)*tan(x))=2/2!*x^2-128/6!*x^6+253952/10!*x^10...

2, -128, 253952, -2863136768, 107451055603712, -10140668012798148608, 2022780765718183801782272, -757569427466144902069404827648 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,1`
	LINKS	`Table of n, a(n) for n=0..7.`
	FORMULA	`(-1)^n * 2^(6n+1) * A090681(n).`
	CROSSREFS	`Sequence in context: A086190 A024345 A012524 * A209248 A153425 A296060` `Adjacent sequences: A012667 A012668 A012669 * A012671 A012672 A012673`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (patrick.demichel(AT)hp.com)`
	STATUS	`approved`

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Last modified March 28 08:01 EDT 2023. Contains 361579 sequences. (Running on oeis4.)