# A046668 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 7 5 9 6 10 7 11 8 12 9 14 10 15 11 16 12 17 13 18 14 19 15 20 16 21 17 24 18 28 19 32 20 33 21 39