# A052607 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 0
4 24
5 120
6 720
7 10080
8 80640
9 1088640
10 14515200
11 199584000
12 3353011200
13 56043187200
14 1046139494400
15 20922789888000
16 439378587648000
17 9959247986688000
18 236887827111936000
19 5960609920032768000