# A193021 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 9 5 19 6 42 7 93 8 205 9 453 10 1003 11 2221 12 4918 13 10892 14 24126 15 53442 16 118384 17 262248 18 580946 19 1286953 20 2850965 21 6315712 22 13991153 23 30994539 24 68662111 25 152107038 26 336962513 27 746472721 28 1653660451 29 3663352982 30 8115423952 31 17978094917