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A054516 as a simple table

na(n)
30
42
52
66
7-4
850
9-258
101862
11-14824
12133506
13-1334950
1414684582
15-176214828
162290792946
17-32071101034
18481066515750
19-7697064251728
20130850092279682
21-2355301661033934
2244750731559645126
23-895014631192902100
2418795307255050944562
25-413496759611120779858

[0,2,2,6,-4,50,-258,1862,-14824,133506,-1334950,
 14684582,-176214828,2290792946,-32071101034,
 481066515750,-7697064251728,130850092279682,
 -2355301661033934,44750731559645126,
 -895014631192902100,18795307255050944562,
 -413496759611120779858]