# A005368 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 3
4 6
5 15
6 42
7 109
8 320
9 979
10 3137
11 10603
12 37728
13 140423
14 546859
15 2220294
16 9374309
17 41059926
18 186149869
19 871717073
20 4208841555
21 20917405824
22 106849492793