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A081581 as a simple table

na(n)
01
11
21
31
48
51
61
715
815
91
101
1122
1278
1322
141
151
1629
17190
18190
1929
201
211
2236
23351
24848
25351
2636
271
281
2943
30561
312339
322339
33561
3443
351
361
3750
38820
395006
409766
415006
42820
4350
441
451
4657
471128
489192
4928806
5028806
519192
521128
5357
541
551
5664
571485
5815240
5968034
60116208
6168034
6215240
631485
6464
651

[1,1,1,1,8,1,1,15,15,1,1,22,78,22,1,1,29,190,190,
 29,1,1,36,351,848,351,36,1,1,43,561,2339,2339,561,
 43,1,1,50,820,5006,9766,5006,820,50,1,1,57,1128,
 9192,28806,28806,9192,1128,57,1,1,64,1485,15240,
 68034,116208,68034,15240,1485,64,1]