[0,1,1,3,3,3,6,6,6,6,10,10,10,10,10,15,15,15,15, 15,15,21,21,21,21,21,21,21,28,28,28,28,28,28,28, 28,36,36,36,36,36,36,36,36,36,45,45,45,45,45,45, 45,45,45,45,55,55,55,55,55,55,55,55,55,55,55,66, 66,66,66,66,66]