# A052581 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 0
4 24
5 120
6 720
7 5040
8 80640
9 1088640
10 14515200
11 199584000
12 3353011200
13 62270208000
14 1220496076800
15 24845812992000
16 543992537088000
17 12804747411456000
18 320118685286400000
19 8393511928209408000