x^{10}+10 x^9 y+45 x^8 y^2+120 x^7 y^3+210 x^6 y^4+252 x^5 y^5+210 x^4 \
y^6+120 x^3 y^7+45 x^2 y^8+10 x y^9+y^{10}
