c; 46656 x^10 - 93312 x^12 + 46656 x^14 + 291600 x^8 y^2 - 629856 x^10 y^2 + 338256 x^12 y^2 + 156250000 y^4 - 509375000 x^2 y^4 + 609315625 x^4 y^4 - 317388150 x^6 y^4 + 62630361 x^8 y^4 - 1421172 x^10 y^4 - 296875000 y^6 + 721281250 x^2 …

https://hyperion64-universe.hatenadiary.org/entry/20110719/1311083646