id:A012670 - OEIS Search Results

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

+0
2

2, -128, 253952, -2863136768, 107451055603712, -10140668012798148608, 2022780765718183801782272, -757569427466144902069404827648 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`(-1)^n * 2^(6n+1) * A090681(n).`
	CROSSREFS	`Sequence in context: A086190 A024345 A012524 this_sequence A090121 A003369 A099824` `Adjacent sequences: A012667 A012668 A012669 this_sequence A012671 A012672 A012673`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

AT&T Labs Research