# A111538 (b-file synthesized from sequence entry)
0 1
1 3
2 14
3 84
4 600
5 4908
6 44952
7 454344
8 5016768
9 60062352
10 775089312
11 10728930912
12 158638465536
13 2496437377728
14 41674737264000
15 735831528563328
16 13704461848753152
17 268562085051533568
18 5525005742876244480