# A377683 (b-file synthesized from sequence entry)
0 1
1 0
2 6
3 9
4 96
5 450
6 3132
7 22680
8 179904
9 1578528
10 15282000
11 162304560
12 1879227072
13 23579281440
14 318874800384
15 4625170411680
16 71640771563520
17 1180394962790400
18 20616532017767424
19 380509312545031680
20 7400308896979660800
21 151271976281858611200
22 3242509236999683481600