# A012471 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 1
4 -12
5 43
6 -315
7 2987
8 -24976
9 288541
10 -3544965
11 46607053
12 -707823996
13 11389328039
14 -199011366463
15 3776136616951
16 -76078523849280
17 1640713749767833
18 -37603782922082121
19 910746316680339641