# A177278 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 5040
8 30240
9 159840
10 773040
11 3556752
12 16068708
13 72870932
14 336443754
15 1563452344
16 7255541240
17 33461906400
18 153007409088
19 693538405248
20 3120781544064