4205568domain: NAppears in sequencesTriangle T(n,m) of the coefficients JacobiNC(x,y) = sum_{n>0} sum_{m=0..n-1} (-1)^m* T(n,m) *x^(2*n) *y^(2*m)/(2*n)!.at n=26A181613Expansion of Sum_{k>=0} (x * (2 + x^k))^k.at n=22A360771Expansion of g.f. A(x) = Sum_{n=-oo..+oo} x^n * (2 + x^n)^(2*n).at n=11A363558