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A196865 as a simple table

na(n)
01
13
218
3-117
4-1971
516119
6343278
7-3036528
8-71818164
9661017348
1016593480504
11-156436510221
12-4080815440497
1339095628518637
141047594828442626
15-10152600834566916
16-277489726161424569
172712640349690579349
1875279129630178436622
19-740885355955719640809

[1,3,18,-117,-1971,16119,343278,-3036528,
 -71818164,661017348,16593480504,-156436510221,
 -4080815440497,39095628518637,1047594828442626,
 -10152600834566916,-277489726161424569,
 2712640349690579349,75279129630178436622,
 -740885355955719640809]