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A325748 as a simple table

na(n)
10
20
31
4-3
56
6-9
79
80
9-27
1081
11-161
12231
13-165
14-363
152079
16-6435
1716071
18-35343
1970686
20-130339
21222717
22-352715
23515944
24-692967
25849299
26-950455
27996435
28-1042415
291042415
301
31-6926071
3236516481
33-137549665
34436362817
35-1233496132
363197432557

[0,0,1,-3,6,-9,9,0,-27,81,-161,231,-165,-363,2079,
 -6435,16071,-35343,70686,-130339,222717,-352715,
 515944,-692967,849299,-950455,996435,-1042415,
 1042415,1,-6926071,36516481,-137549665,436362817,
 -1233496132,3197432557]