# A129325 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 1
4 8
5 60
6 440
7 3290
8 25424
9 204120
10 1705680
11 14836470
12 134240040
13 1262060228
14 12313382536
15 124509169330
16 1303109358880
17 14098102762160
18 157473907149600
19 1813923418494126
20 21523529286435000
21 262809607270736540