# A067455 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 6
5 24
6 120
7 720
8 5040
9 40320
10 0
11 39916800
12 239500800
13 2075673600
14 21794572800
15 261534873600
16 3487131648000
17 50812489728000
18 800296713216000
19 13516122267648000
20 0
21 25545471085854720000
22 281000181944401920000
23 4308669456480829440000
24 77556050216654929920000