# A009409 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -1
4 0
5 49
6 -165
7 -393
8 -504
9 66753
10 -414225
11 21295
12 -15435816
13 561504241
14 -5685997317
15 34755442407
16 -746778152400
17 18822723988481
18 -281687621998401
19 3781703063806559
20 -80079140948241200
21 1899387285774263089