# A148415 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 17 5 61 6 229 7 905 8 3637 9 15030 10 63386 11 272276 12 1187268 13 5239511 14 23349563 15 104935694 16 475085078 17 2165031594 18 9924717432 19 45736336780 20 211759771698 21 984569348155 22 4594952651327 23 21517502203089 24 101076573807352 25 476152633322594 26 2248955765507576 27 10647947497907067 28 50526530559511271