# A130641 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 6
4 24
5 120
6 720
7 5040
8 40321
9 362891
10 3628916
11 39918100
12 479017320
13 6227225880
14 87181167360
15 1307717550721
16 20923481174427
17 355699183594175
18 6402585344613250
19 121649122026669070
20 2432982446760607280