# A170909 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 3
4 24
5 15
6 360
7 5040
8 40320
9 11340
10 1814400
11 39916800
12 47900160
13 6227020800
14 7925299200
15 1307674368000
16 20922789888000
17 11115232128000
18 3201186852864000
19 24329020081766400
20 48658040163532800
21 51090942171709440000
22 1124000727777607680000
23 5170403347776995328000