# A033565 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 19
5 62
6 206
7 694
8 2362
9 8101
10 27951
11 96905
12 337298
13 1177935
14 4125287
15 14482481
16 50950871
17 179584544
18 634020055
19 2241695805
20 7936423123
21 28131425351