# A187750 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 6 5 8 6 10 7 11 8 18 9 20 10 32 11 50 12 110 13 153 14 507 15 727 16 900 17 982 18 1489 19 1737 20 1974 21 3085