# A234718 (b-file synthesized from sequence entry) 1 2 2 3 3 5 4 6 5 9 6 10 7 12 8 18 9 24 10 30 11 48 12 60 13 72 14 96 15 120 16 144 17 192 18 256 19 288 20 384 21 512 22 576