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A215936 as a simple table

na(n)
01
11
20
31
4-2
55
6-12
729
8-70
9169
10-408
11985
12-2378
135741
14-13860
1533461
16-80782
17195025
18-470832
191136689
20-2744210
216625109
22-15994428
2338613965
24-93222358
25225058681
26-543339720
271311738121
28-3166815962
297645370045
30-18457556052
3144560482149

[1,1,0,1,-2,5,-12,29,-70,169,-408,985,-2378,5741,
 -13860,33461,-80782,195025,-470832,1136689,
 -2744210,6625109,-15994428,38613965,-93222358,
 225058681,-543339720,1311738121,-3166815962,
 7645370045,-18457556052,44560482149]