# A001500 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 55
4 2008
5 153040
6 20933840
7 4662857360
8 1579060246400
9 772200774683520
10 523853880779443200
11 477360556805016931200
12 569060910292172349004800
13 868071731152923490921728000