# A161518 (b-file synthesized from sequence entry)
0 1
1 21
2 230
3 1749
4 10373
5 51107
6 217602
7 822504
8 2814141
9 8843868
10 25820674
11 70673825
12 182690494
13 448730093
14 1052649257
15 2368601685
16 5131231668
17 10736569602
18 21758936146
19 42815701060
20 81978913225
21 153027659730