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A215112 as a simple table

na(n)
0-1
1-1
21
3-4
48
5-19
642
7-95
8213
9-479
101076
11-2418
125433
13-12208
1427431
15-61637
16138497
17-311200
18699260
19-1571223
203530506
21-7932975
2217825233
23-40052935
2489998128
25-202223958
26454393109
27-1021012048
282294193247
29-5155005433
3011583192065

[-1,-1,1,-4,8,-19,42,-95,213,-479,1076,-2418,5433,
 -12208,27431,-61637,138497,-311200,699260,
 -1571223,3530506,-7932975,17825233,-40052935,
 89998128,-202223958,454393109,-1021012048,
 2294193247,-5155005433,11583192065]