# A003704 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 3
4 -10
5 45
6 -256
7 1743
8 -13840
9 125625
10 -1282816
11 14554683
12 -181649920
13 2473184805
14 -36478744576
15 579439207623
16 -9861412096000
17 179018972217585
18 -3452931391553536
19 70518070842040563
20 -1520176422094766080