# A007118 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 -3
4 16
5 -80
6 440
7 -3171
8 24680
9 -218952
10 2170018
11 -23566675
12 279907076
13 -3603250716
14 49968204078
15 -742893013695
16 11785962447792
17 -198748512229968
18 3550002639307890
19 -66954457199954115
20 1329661510693923636