# A003298 (b-file synthesized from sequence entry)
0 1
1 18
2 648
3 2160
4 1399680
5 75582720
6 149653785600
7 2693768140800
8 8620058050560
9 7913213290414080
10 284875678454906880
11 25638811060941619200
12 155678860762037511782400
13 112088779748667008483328