# A303704 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 4 5 5 6 6 7 8 8 10 9 12 10 15 11 16 12 20 13 21 14 24 15 28 16 40 17 48 18 56 19 60 20 72 21 88 22 120 23 168 24 240 25 840