# A336734 (b-file synthesized from sequence entry)
0 0
1 1
2 57
3 1071
4 12279
5 106738
6 781458
7 5111986
8 30980370
9 178047831
10 985621119
11 5311715977
12 28075774881
13 146309927344
14 754544640000
15 3861338821620
16 19646614600164
17 99532074868285
18 502608221035605
19 2531829420822835
20 12730273358124315
21 63919766245452606