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A112478 as a simple table

na(n)
01
12
2-2
36
4-22
590
6-394
71806
8-8558
941586
10-206098
111037718
12-5293446
1327297738
14-142078746
15745387038
16-3937603038
1720927156706
18-111818026018
19600318853926
20-3236724317174
2117518619320890
22-95149655201962
23518431875418926
24-2832923350929742
2515521467648875090

[1,2,-2,6,-22,90,-394,1806,-8558,41586,-206098,
 1037718,-5293446,27297738,-142078746,745387038,
 -3937603038,20927156706,-111818026018,
 600318853926,-3236724317174,17518619320890,
 -95149655201962,518431875418926,-2832923350929742,
 15521467648875090]