A012780 - OEIS

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A012780

Expansion of arcsin(tan(x)).

1, 3, 45, 1743, 133305, 17089083, 3302755365, 896199578823, 324729845802225, 151401766241310963, 88276508686397289885, 62925559543228826845503, 53835082550295989275314345, 54438337988081689498005862443 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`arcsin(sec(x)sin(x))=x+3/3!x^3+45/5!x^5+1743/7!x^7+133305/9!x^9...` `arccos(tan(x)) = Pi/2 - x - 3x^3/3! - 45x^5/5! - 1743x^7/7! -...`
	CROSSREFS	`Sequence in context: A144951 A079484 A012494 * A072503 A154242 A163002` `Adjacent sequences: A012777 A012778 A012779 * A012781 A012782 A012783`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 19:48 EST 2012. Contains 205955 sequences.