# A148075 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 9 5 21 6 56 7 169 8 482 9 1505 10 4655 11 14419 12 46683 13 153632 14 522567 15 1760914 16 6050077 17 20830801 18 72215812 19 256321026 20 908687720 21 3272602542 22 11754785559 23 42458425816 24 154767487534 25 565357807589 26 2092065007291 27 7725542715670 28 28717905731799 29 106970060346082 30 399403757982693 31 1504067532147492