69, 67, 65, 63, 61, 59, 57, 56,
52, 50, 48, 46, 44, 43, 42,
37, 35, 33, 32, 31, 30,
24, 23, 22, 21, 20,
15, 14, 13, 12,
8, 7, 6,
3, 2

規則性は?

2 6 12 20 30 42 56は三角数の位置