# A031988 (b-file synthesized from sequence entry) 1 0 2 1 3 2 4 4 5 5 6 8 7 13 8 14 9 17 10 26 11 40 12 41 13 44 14 53 15 80 16 121 17 122 18 125 19 134 20 161 21 242