# A187535 (b-file synthesized from sequence entry)
0 1
1 2
2 36
3 1200
4 58800
5 3810240
6 307359360
7 29682132480
8 3339239904000
9 428906814336000
10 61934143990118400
11 9931984545324441600
12 1751339941492209868800
13 336796142594655744000000
14 70149825129001153536000000
15 15732267448930658699673600000