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A321937 as a simple table

na(n)
01
1-1
21
367
4-283
5-5911
6269891
7114551
8-9390523
9-1021798901
10273468378049
113918564638257
12-872697935308349
13-131115162268691
141397912875942181
152172284899403876321
16-3926446823184958835813
17-284746035618826337921
18286113629384558337084185927

[1,-1,1,67,-283,-5911,269891,114551,-9390523,
 -1021798901,273468378049,3918564638257,
 -872697935308349,-131115162268691,
 1397912875942181,2172284899403876321,
 -3926446823184958835813,-284746035618826337921,
 286113629384558337084185927]