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A140290 as a simple table

na(n)
0-1
12
2-4
39
4-25
582
6-284
7969
8-3185
910082
10-30964
1193129
12-276745
13818482
14-2421644
157188489
16-21428705
1764121282
18-192388324
19578087049
20-1737827065
215223134482
22-15690187004
2347105428809
24-141351839825
25424023394082
26-1271763913684

[-1,2,-4,9,-25,82,-284,969,-3185,10082,-30964,
 93129,-276745,818482,-2421644,7188489,-21428705,
 64121282,-192388324,578087049,-1737827065,
 5223134482,-15690187004,47105428809,-141351839825,
 424023394082,-1271763913684]