# A012904 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 11
4 -30
5 215
6 -1095
7 9200
8 -67060
9 676565
10 -6364125
11 75816050
12 -870716550
13 12014125175
14 -162677426275
15 2556597056000
16 -39838813521000
17 703292880031625
18 -12389158068197625
19 242880759376082750