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A156921 as a simple table

na(n)
01
11
21
31
4-6
51
67
7-79
8119
9126
10-270
111
1228
13-515
141654
158689
16-65864
17142371
18-82242
19-99090
20113400
211
2286
23-2255
245784
25300930
26-3904584
2720663714
28-41517272
29-80232259
30657717054

[1,1,1,1,-6,1,7,-79,119,126,-270,1,28,-515,1654,
 8689,-65864,142371,-82242,-99090,113400,1,86,
 -2255,5784,300930,-3904584,20663714,-41517272,
 -80232259,657717054]