# A047106 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 21
4 73
5 261
6 957
7 3547
8 13267
9 50027
10 189780
11 723456
12 2769333
13 10637790
14 40984228
15 158306891
16 612856611
17 2377260192
18 9237543329
19 35951472496
20 140116098727
21 546778366195
22 2136168391753
23 8354417782742
24 32705042089703