# A293192 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 21
4 128
5 745
6 1440
7 -89075
8 -3031040
9 -76951215
10 -1784742400
11 -39056351675
12 -785147904000
13 -12815410658375
14 -64977212518400
15 8229576066616125
16 587339977981952000
17 29185361934747006625
18 1256364637107240960000
19 48860370609512175371125
20 1686271331087959982080000