# A006493 (b-file synthesized from sequence entry) 3 1 4 0 5 6 6 7 7 28 8 54 9 135 10 286 11 627 12 1313 13 2730 14 5565 15 11212 16 22304 17 43911 18 85614 19 165490 20 317373 21 604296 22 1143054 23 2149074 24 4017950 25 7473180 26 13832910 27 25490115 28 46774448 29 85494900 30 155693873 31 282551856 32 511101624 33 921676437 34 1657238030 35 2971622493 36 5314551351