# A108953 (b-file synthesized from sequence entry)
0 1
1 4
2 23
3 192
4 2184
5 31728
6 560412
7 11630592
8 276921216
9 7433925120
10 222038547840
11 7301712936960
12 262112637864960
13 10198096116526080
14 427456901317420800
15 19202256562264473600
16 920321900537337446400
17 46874495077202077286400
18 2528269620326135923507200