# A131444 (b-file synthesized from sequence entry)
1 1
2 2
3 2
4 12
5 60
6 60
7 280
8 40320
9 22680
10 3628800
11 1900800
12 479001600
13 6227020800
14 6227020800
15 1307674368000
16 1307674368000
17 13680285696000
18 582033973248000
19 24329020081766400
20 2432902008176640000