# A009392 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -3
4 8
5 25
6 -121
7 -427
8 3128
9 12465
10 -124921
11 -555731
12 7158128
13 35135945
14 -557749921
15 -2990414715
16 56767019408
17 329655706465
18 -7316056402321
19 -45692713833379
20 1164842760597368
21 7777794952988025
22 -224574978081433321