= {
0, 1, 3, 6, 10, 15, 21, 28, 36, 45,
55, 66, 78, 91, 105, 120, 136, 153, 171, 190,
210, 231, 253, 276, 300, 325, 351, 378, 406, 435,
465, 496, 528, 561, 595, 630, 666, 703, 741, 780,
820, 861, 903, 946, 990, 1035, 1081, 1128, 1176, 1225,
1275, 1326, 1378, 1431, 1485, 1540, 1596, 1653, 1711, 1770,
1830, 1891, 1953, 2016, 2080, 2145, 2211, 2278, 2346, 2415,
2485, 2556, 2628, 2701, 2775, 2850, 2926, 3003, 3081, 3160,
3240, 3321, 3403, 3486, 3570, 3655, 3741, 3828, 3916, 4005,
4095, 4186, 4278, 4371, 4465, 4560, 4656, 4753, 4851, 4950}