# A075210 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 1
5 9
6 39
7 197
8 721
9 2717
10 8211
11 19836
12 74497
13 132611
14 403534
15 1127416
16 2364402
17 4173316
18 15604400
19 21318428
20 73965916
21 154211880