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A216597 as a simple table

na(n)
00
1-1
2-5
3-22
4-91
5-364
6-1430
7-5564
8-21541
9-83200
10-321100
11-1239446
12-4787770
13-18514119
14-71683040
15-277913233
16-1078918139
17-4194134516
18-16324764560
19-63616690111
20-248187382924
21-969250588865
22-3788814577730
23-14823325196459
24-58040165033110
25-227415509487686

[0,-1,-5,-22,-91,-364,-1430,-5564,-21541,-83200,
 -321100,-1239446,-4787770,-18514119,-71683040,
 -277913233,-1078918139,-4194134516,-16324764560,
 -63616690111,-248187382924,-969250588865,
 -3788814577730,-14823325196459,-58040165033110,
 -227415509487686]