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A138681 as a simple table

na(n)
21
31
41
51
64
71
816
97
106
117
121
1310
1437
1535
1637
1744
1825
1920
2014
2149
228
2365
2417
258
2696
2756
2861
2930
3045
3149
328
337
34123
3544
3673
379
38101
39115
40128
41148
42158
4382
4485
45112
46156
47121
48148
4934
5010

[1,1,1,1,4,1,16,7,6,7,1,10,37,35,37,44,25,20,14,
 49,8,65,17,8,96,56,61,30,45,49,8,7,123,44,73,9,
 101,115,128,148,158,82,85,112,156,121,148,34,10]