# A199540 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 24
4 192
5 -320
6 -138240
7 -10214400
8 -669204480
9 -43782488064
10 -2628064051200
11 -91419903590400
12 14288196206592000
13 5367226212019077120
14 1259862249808204922880
15 257126813359346810880000
16 46529454048255997378560000