# A157312 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 5
5 18
6 84
7 481
8 3249
9 25359
10 224000
11 2208441
12 24019991
13 285633470
14 3685413373
15 51271476627
16 764944009086
17 12182390286127
18 206262410584138
19 3699483818281188
20 70067511789111404
21 1397379232420943285