[1,1,3,3,6,6,10,10,15,15,21,21,28,28,36,36,45,45, 55,55,66,66,78,78,91,91,105,105,120,120,136,136, 153,153,171,171,190,190,210,210,231,231,253,253, 276,276,300,300,325,325,351,351,378,378,406,406, 435,435]