# A009370 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 7
4 -20
5 125
6 -721
7 5731
8 -49440
9 505529
10 -5716921
11 72560255
12 -1009426340
13 15366052533
14 -253286287801
15 4501151653979
16 -85717611666720
17 1742059862631537
18 -37625735499057361
19 860703388428813303