# A309174 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 11
4 65
5 369
6 3139
7 24667
8 268449
9 2777345
10 34932131
11 432114891
12 6790407073
13 97969389361
14 1671204338595
15 28382893729499
16 557174580764609
17 10512263160373377
18 228918738980395459
19 4817409763554888715
20 115117419384636141441
21 2688602544800222293361