# A109583 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 6
4 24
5 120
6 0
7 5040
8 80640
9 725760
10 3628800
11 39916800
12 1437004800
13 24908083200
14 261534873600
15 0
16 83691159552000
17 2489811996672000
18 44816615940096000
19 364935301226496000
20 9731608032706560000