# A221913 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 1
5 24
6 6
7 120
8 36
9 1
10 720
11 240
12 12
13 5040
14 1800
15 120
16 1
17 40320
18 15120
19 1200
20 20
21 362880
22 141120
23 12600
24 300
25 1
26 3628800
27 1451520
28 141120
29 4200
30 30
31 39916800
32 16329600
33 1693440
34 58800
35 630
36 1
37 479001600
38 199584000
39 21772800
40 846720
41 11760
42 42