# A129333 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 1
4 16
5 200
6 2320
7 26460
8 303968
9 3557904
10 42676320
11 526076100
12 6673368240
13 87148818328
14 1171554274800
15 16206294360620
16 230561544221120
17 3371256518888480
18 50628767109223872
19 780358333403627796