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A159974 as a simple table

na(n)
21
31
41
52
61
72
83
92
102
115
124
133
144
155
1612
175
184
196
2010
2112
2228
236
245
258
2615
2724
2828
2965
307
316
3210
3320
3436
3556
3665
37151
388
397
4012
4125
4248
4384
44130
45151
46351
479
488
4914
5030
5160
52112
53195
54302
55351
56816
5710
589
5916
6035
6172
62140
63260
64453
65702
66816
671897

[1,1,1,2,1,2,3,2,2,5,4,3,4,5,12,5,4,6,10,12,28,6,
 5,8,15,24,28,65,7,6,10,20,36,56,65,151,8,7,12,25,
 48,84,130,151,351,9,8,14,30,60,112,195,302,351,
 816,10,9,16,35,72,140,260,453,702,816,1897]