# A057507 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 3
5 10
6 18
7 46
8 95
9 236
10 528
11 1288
12 2936
13 6984
14 16212
15 38528
16 90717
17 216648
18 516358
19 1240818
20 2979992