# A173221 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 60
4 3528
5 377620
6 63642600
7 15485843814
8 5128034120832
9 2214330161840640
10 1207205860726123200
11 810202288257005858280
12 655934516902959161345280
13 630002861547863478457648320