# A124827 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 8 5 20 6 12 7 42 8 16 9 54 10 40 11 110 12 48 13 156 14 84 15 120 16 64 17 272 18 108 19 342 20 160 21 252