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A216605 as a simple table

na(n)
06
1-1
211
3-4
431
5-16
698
7-64
8327
9-256
101126
11-1024
123958
13-4083
1414116
15-16189
1650887
17-63768
18184958
19-249547
20676626
21-970771
222488156
23-3756867
249188406
25-14474916
2634049481
27-55564474
28126540536
29-212637571
30471398623
31-811660849
321759603367

[6,-1,11,-4,31,-16,98,-64,327,-256,1126,-1024,
 3958,-4083,14116,-16189,50887,-63768,184958,
 -249547,676626,-970771,2488156,-3756867,9188406,
 -14474916,34049481,-55564474,126540536,-212637571,
 471398623,-811660849,1759603367]