# A009330 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -1
4 6
5 1
6 -72
7 55
8 1456
9 -2207
10 -47104
11 79727
12 2390784
13 -2834207
14 -180612096
15 81045991
16 18625189888
17 1107720001
18 -2431403622400
19 -715785186337
20 384624656646144
21 165075476417857
22 -72343735465672704
23 -44818254949260905