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A215794 as a simple table

na(n)
0-1
1-31
2-609
3-11711
4-224833
5-4315871
6-82846113
7-1590286719
8-30526618241
9-585978870687
10-11248256653025
11-215917815567167
12-4144686996149441
13-79560041170858591
14-1527208244431770145
15-29315784501060168447
16-562736106255347592449

[-1,-31,-609,-11711,-224833,-4315871,-82846113,
 -1590286719,-30526618241,-585978870687,
 -11248256653025,-215917815567167,
 -4144686996149441,-79560041170858591,
 -1527208244431770145,-29315784501060168447,
 -562736106255347592449]