43417domain: NAppears in sequencesa(n) = number of solutions to the Diophantine equation x+y^2+z^3=n^4 with positive x,y,z.at n=25A121876Expansion of x^3*(x-1)^2*(x+1) / (x^6-3*x^5+3*x^4-x+1).at n=42A135991