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A216540 as a simple table

na(n)
10
20
3-1
4-8
5-45
6-221
7-1014
8-4472
9-19227
10-81224
11-338767
12-1399320
13-5736705
14-23377770
15-94804944
16-382930847
17-1541565610
18-6188513994
19-24784429501
20-99058333803
21-395227906723
22-1574536914951
23-6264614281978
24-24896955293210
25-98848880984490

[0,0,-1,-8,-45,-221,-1014,-4472,-19227,-81224,
 -338767,-1399320,-5736705,-23377770,-94804944,
 -382930847,-1541565610,-6188513994,-24784429501,
 -99058333803,-395227906723,-1574536914951,
 -6264614281978,-24896955293210,-98848880984490]