# A179853 (b-file synthesized from sequence entry)
0 1
1 6
2 1080
3 967680
4 2494800000
5 14122883174400
6 149450965100236800
7 2657377766797737984000
8 73600830148552343949312000
9 3000680514334863360000000000000
10 172357905733383653098084542873600000
11 13469219468410593291134233865512550400000