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A103979 as a simple table

na(n)
00
11
2-2
314
4-4
5166
6-292
72092
8-136
928102
10-52412
11131468
12-2264
135692636
14-10892936
1583688344
16-20155888
171246068806
18-541124
192675231852
20-19548472
2140491935468
22-552572485496
234314388905704
24-13091776816
2565972020761116

[0,1,-2,14,-4,166,-292,2092,-136,28102,-52412,
 131468,-2264,5692636,-10892936,83688344,-20155888,
 1246068806,-541124,2675231852,-19548472,
 40491935468,-552572485496,4314388905704,
 -13091776816,65972020761116]