# A375700 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 0
4 8
5 20
6 80
7 420
8 11648
9 100800
10 912000
11 9055200
12 181547520
13 2790627840
14 41568334080
15 635617382400
16 13172198645760
17 273158953267200
18 5632405756723200
19 117530452124467200
20 2815021136030515200
21 71252240659839590400
22 1844362570865444044800