Numerators of coefficients of expansion of arctan(x)^2 = x^2 - 2/3*x^4 + 23/45*x^6 - 44/105*x^8 + 563/1575*x^10 - 3254/10395*x^12 + ...

A002428

Numerators of coefficients of expansion of arctan(x)^2 = x^2 - 2/3*x^4 + 23/45*x^6 - 44/105*x^8 + 563/1575*x^10 - 3254/10395*x^12 + ...

Terms

    a(0) =0a(1) =1a(2) =-2a(3) =23a(4) =-44a(5) =563a(6) =-3254a(7) =88069a(8) =-11384a(9) =1593269a(10) =-15518938a(11) =31730711a(12) =-186088972a(13) =3788707301a(14) =-5776016314a(15) =340028535787a(16) =-667903294192

External references