# A369119 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 6
4 120
5 120
6 5040
7 5040
8 40320
9 362880
10 39916800
11 39916800
12 6227020800
13 6227020800
14 87178291200
15 1307674368000
16 355687428096000
17 355687428096000
18 121645100408832000
19 121645100408832000
20 2432902008176640000
21 51090942171709440000