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A012780 Expansion of arcsin(tan(x)). 4

%I

%S 1,3,45,1743,133305,17089083,3302755365,896199578823,324729845802225,

%T 151401766241310963,88276508686397289885,62925559543228826845503,

%U 53835082550295989275314345,54438337988081689498005862443

%N Expansion of arcsin(tan(x)).

%C arcsin(sec(x)*sin(x))=x+3/3!*x^3+45/5!*x^5+1743/7!*x^7+133305/9!*x^9...

%C arccos(tan(x)) = Pi/2 - x - 3*x^3/3! - 45*x^5/5! - 1743*x^7/7! -...

%K nonn

%O 0,2

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

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Last modified January 25 08:59 EST 2022. Contains 350565 sequences. (Running on oeis4.)