# A013222 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 1
4 -6
5 15
6 -105
7 390
8 -3500
9 15785
10 -181125
11 807750
12 -12261150
13 25793625
14 -784508725
15 -9327500000
16 54587949000
17 -5375441316375
18 69535091676375
19 -2529291250424250
20 40837337931958750
21 -1268829193109066875