# A168406 (b-file synthesized from sequence entry)
0 1
1 2
2 16
3 496
4 63488
5 32899840
6 68049141760
7 560546415810560
8 18415229458563727360
9 2416302337337071616327680
10 1267360474688679165942982246400
11 2658246833688954938616062542151680000