# A012911 (b-file synthesized from sequence entry)
0 0
1 2
2 -3
3 12
4 -66
5 488
6 -4464
7 49112
8 -628624
9 9201728
10 -151417984
11 2768998144
12 -55689376768
13 1221892625536
14 -29042327308032
15 743397015460096
16 -20387623448193024
17 596407256671842304
18 -18537290145521811456