# A001770 (b-file synthesized from sequence entry) 1 2 2 4 3 8 4 10 5 12 6 14 7 18 8 32 9 48 10 54 11 72 12 148 13 184 14 248 15 270 16 274 17 420 18 1340 19 1438 20 1522 21 1638 22 1754 23 1884 24 2014 25 2170 26 2548 27 2622 28 2652 29 2704 30 13510 31 21738 32 25624 33 41934 34 51478 35 52540 36 53230 37 172300 38 245728 39 350028 40 1194164