# A012352 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 -3
4 16
5 -50
6 200
7 -336
8 -6064
9 116712
10 -1823552
11 24444200
12 -343290400
13 4725483984
14 -68637208848
15 1009375584840
16 -15551178814464
17 244877850035008
18 -4005060390790656
19 66944176204337280