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A181985 as a simple table

na(n)
11
21
31
41
51
61
71
81
95
101
111
121
1319
1461
151
161
171
1869
191513
201385
211
221
231
24251
2533661
26315523
2750521
281
291
301
31923
32750751
3360376809
34136085041
352702765
361
371
381
393431
4017116009
4111593285251
42288294050521
43105261234643
44199360981
451

[1,1,1,1,1,1,1,1,5,1,1,1,19,61,1,1,1,69,1513,1385,
 1,1,1,251,33661,315523,50521,1,1,1,923,750751,
 60376809,136085041,2702765,1,1,1,3431,17116009,
 11593285251,288294050521,105261234643,199360981,1]