Numerators of coefficients in expansion of x/((x^2+1)*arctan(x)), even powers only.

A216254

Numerators of coefficients in expansion of x/((x^2+1)*arctan(x)), even powers only.

Terms

    a(0) =1a(1) =-2a(2) =26a(3) =-502a(4) =7102a(5) =-44834a(6) =295272982a(7) =-122850554a(8) =19437784634

External references