# A024353 (b-file synthesized from sequence entry) 1 4 2 12 3 15 4 21 5 24 6 35 7 40 8 45 9 55 10 56 11 60 12 63 13 72 14 77 15 80 16 84 17 91 18 99 19 105 20 112 21 117