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A138803 as a simple table

na(n)
10
21
33
48
520
647
7105
8224
9456
10881
111595
122632
133692
143359
15-2927
16-27776
17-103088
18-304607
19-803149
20-1966392
21-4549884
22-10029361
23-21114759
24-42375200
25-80491880
26-142437359
27-226667157
28-294543992
29-191015460
30556551487
313216934945

[0,1,3,8,20,47,105,224,456,881,1595,2632,3692,
 3359,-2927,-27776,-103088,-304607,-803149,
 -1966392,-4549884,-10029361,-21114759,-42375200,
 -80491880,-142437359,-226667157,-294543992,
 -191015460,556551487,3216934945]