# A013177 (b-file synthesized from sequence entry)
0 2
1 16
2 560
3 42880
4 5692160
5 1158860800
6 335091660800
7 130514735104000
8 65860132462592000
9 41792278392537088000
10 32569972497977507840000
11 30580999289444580720640000
12 34048056335378925092864000000