1/(64 pi sqrt2) int_0^infty erf(x sqrt2)e^(-x^2)erfc x^{1,2,3,4,5,6,7,8} dx.{48,48,40,30,21,14,9, 45/8} -1/sqrt pi +1/(4sqrt(2pi)) + (arctan sqrt2)/(2pi)^(3/2)