# A012961 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 -8
4 18
5 50
6 15
7 -4580
8 19180
9 126890
10 -76725
11 -26697200
12 158352150
13 2084909450
14 -4854010525
15 -695709345500
16 5181906327000
17 115119442831250
18 -487098850343625
19 -54146131234247000
20 475896724869036250