# A018723 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 4 5 6 6 7 7 11 8 12 9 14 10 21 11 22 12 28 13 33 14 42 15 44 16 66 17 77 18 84 19 132 20 154 21 231 22 308 23 462 24 924