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A012780 Expansion of arcsin(tan(x)). 4
1, 3, 45, 1743, 133305, 17089083, 3302755365, 896199578823, 324729845802225, 151401766241310963, 88276508686397289885, 62925559543228826845503, 53835082550295989275314345, 54438337988081689498005862443 (list; graph; refs; listen; history; text; 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 - 3*x^3/3! - 45*x^5/5! - 1743*x^7/7! -...

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A144951 A079484 A012494 * A072503 A154242 A331710

Adjacent sequences:  A012777 A012778 A012779 * A012781 A012782 A012783

KEYWORD

nonn

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified November 30 19:02 EST 2021. Contains 349424 sequences. (Running on oeis4.)