# A169815 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 12
5 4500
6 9000
7 1512630000
8 1452124800000
9 111152892816000000
10 3112280998848000000
11 1849326140334157445511936000000
12 388358489470173063557506560000000
13 1607761625123067582500188167647056604083200000000