# A129994 (b-file synthesized from sequence entry) 0 1 1 2 2 1 3 2 4 4 5 1 6 2 7 6 8 6 9 1 10 2 11 8 12 12 13 8 14 1 15 2 16 10 17 20 18 20 19 10 20 1 21 2 22 12 23 30 24 40 25 30 26 12 27 1 28 2 29 14 30 42 31 70 32 70 33 42 34 14 35 1 36 2 37 16 38 56 39 112 40 140 41 112 42 56 43 16 44 1 45 2 46 18 47 72 48 168 49 252 50 252 51 168 52 72 53 18 54 1