# A084080 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 3 5 4 6 9 7 15 8 22 9 52 10 91 11 140 12 340 13 612 14 969 15 2394 16 4389 17 7084 18 17710 19 32890 20 53820 21 135720 22 254475 23 420732 24 1068012 25 2017356 26 3362260 27 8579560 28 16301164 29 27343888 30 70068713