Board Thread:Off-topic/@comment-29936852-20191109232409/@comment-34315999-20191227043355

(7+15+8+12+23+20+10+7+7+18+6+12+5) / 13 = 11.5384615385 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, _ What comes next