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A215664 as a simple table

na(n)
03
10
26
3-3
418
5-15
657
7-63
8186
9-246
10621
11-924
122109
13-3393
147251
15-12288
1625146
17-44115
1887726
19-157491
20307293
21-560199
221079370
23-1987890
243798309
25-7043040
2613382817
27-24927429
2847191491
29-88165104
30166501902
31-311686803
32587670810
33-1101562311

[3,0,6,-3,18,-15,57,-63,186,-246,621,-924,2109,
 -3393,7251,-12288,25146,-44115,87726,-157491,
 307293,-560199,1079370,-1987890,3798309,-7043040,
 13382817,-24927429,47191491,-88165104,166501902,
 -311686803,587670810,-1101562311]