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A009337 as a simple table

na(n)
00
11
2-3
37
4-16
540
6-117
7411
8-1720
98384
10-46561
11289595
12-1991504
1314993108
14-122595085
151081616659
16-10239597968
17103522029312
18-1113074512289
1912681693805203
20-152613117638712
211934275341388596
22-25753344727083773

[0,1,-3,7,-16,40,-117,411,-1720,8384,-46561,
 289595,-1991504,14993108,-122595085,1081616659,
 -10239597968,103522029312,-1113074512289,
 12681693805203,-152613117638712,1934275341388596,
 -25753344727083773]