# A058800 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 0
4 1
5 2
6 7
7 27
8 126
9 664
10 3954
11 26190
12 190754
13 1514332
14 12998035
15 119803771
16 1178740932
17 12316480222
18 136060611189
19 1582930919092
20 19328253734491