# A353665 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 0
4 24
5 240
6 1560
7 8400
8 60984
9 912240
10 15938520
11 242998800
12 3300493944
13 44583979440
14 690641504280
15 12868117189200
16 264164524958904
17 5481631005177840
18 112822632387018840
19 2367468210865875600
20 52624238539033647864
21 1258531092544541563440