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A056016 as a simple table

na(n)
01
11
21
3-4
46
5-9
616
7-29
851
9-89
10156
11-274
12481
13-844
141481
15-2599
164561
17-8004
1814046
19-24649
2043256
21-75909
22133211
23-233769
24410236
25-719914
261263361
27-2217044
283890641
29-6827599
3011981601
31-21026244
3236898486
33-64752329
34113632416
35-199410989
36349941891
37-614105209

[1,1,1,-4,6,-9,16,-29,51,-89,156,-274,481,-844,
 1481,-2599,4561,-8004,14046,-24649,43256,-75909,
 133211,-233769,410236,-719914,1263361,-2217044,
 3890641,-6827599,11981601,-21026244,36898486,
 -64752329,113632416,-199410989,349941891,
 -614105209]