# A149368 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 45
5 161
6 651
7 2575
8 10768
9 44901
10 193043
11 833057
12 3653939
13 16134813
14 71923457
15 322774583
16 1457954685
17 6622090289
18 30234131093
19 138642032594
20 638494794892
21 2951054790813
22 13687439364362
23 63680571279683
24 297128054833522
25 1390089493432837
26 6519295339621917
27 30644944208215577