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A098831 as a simple table

na(n)
10
21
31
415
551
6101
751
81
95
10155
111
121051
1351
14105
155
16311
171335
18355
19105
2031
2155
2251
23105
241031
2515
26105
2755
285
29355
30115
311001
323115
3335
34551
35331
361
37305
3851
393305
40555
411111
42305
43135
441131
451135
461505
4751
4831
4910355
505001
511001
521335
531101
54331
55305

[0,1,1,15,51,101,51,1,5,155,1,1051,51,105,5,311,
 1335,355,105,31,55,51,105,1031,15,105,55,5,355,
 115,1001,3115,35,551,331,1,305,51,3305,555,1111,
 305,135,1131,1135,1505,51,31,10355,5001,1001,1335,
 1101,331,305]