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A108946 as a simple table

na(n)
01
1-3
213
3-48
4181
5-675
62521
7-9408
835113
9-131043
10489061
11-1825200
126811741
13-25421763
1494875313
15-354079488
161321442641
17-4931691075
1818405321661
19-68689595568
20256353060613
21-956722646883
223570537526921
23-13325427460800
2449731172316281

[1,-3,13,-48,181,-675,2521,-9408,35113,-131043,
 489061,-1825200,6811741,-25421763,94875313,
 -354079488,1321442641,-4931691075,18405321661,
 -68689595568,256353060613,-956722646883,
 3570537526921,-13325427460800,49731172316281]