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A336971 as a simple table

na(n)
01
10
20
3-1
4-1
5-1
60
74
815
940
1086
11134
1216
13-1060
14-6119
15-25187
16-86678
17-250846
18-537819
19-175233
206998009
2155632942
22310923272
231465146781
246011047682
2520719304348
2649356093300
27-36579100806
28-1549214884054
29-13807417413199
30-92912464763743

[1,0,0,-1,-1,-1,0,4,15,40,86,134,16,-1060,-6119,
 -25187,-86678,-250846,-537819,-175233,6998009,
 55632942,310923272,1465146781,6011047682,
 20719304348,49356093300,-36579100806,
 -1549214884054,-13807417413199,-92912464763743]