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A156857 as a simple table

na(n)
01
10
2-9
310
445
5-108
6-125
7702
8-135
9-3320
104239
1111250
12-31931
13-18180
14165915
15-92762
16-651375
171101168
181747495
19-6710310
20-694179
2130182500
22-28394829
23-101934450
24229069225
25203510232
26-1198850625
27364506562
284767453045

[1,0,-9,10,45,-108,-125,702,-135,-3320,4239,11250,
 -31931,-18180,165915,-92762,-651375,1101168,
 1747495,-6710310,-694179,30182500,-28394829,
 -101934450,229069225,203510232,-1198850625,
 364506562,4767453045]