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A128520 as a simple table

na(n)
11
21
31
42
51
64
72
83
91
106
118
128
137
143
155
161
178
1818
1921
2028
2117
2223
2314
2411
255
268
271
2810
2932
3050
3173
3273
3377
3479
3558
3657
3744
3839
3922
4018
418
4213
431
4412
4550
46103
47166
48221
49238
50289
51256
52269
53226
54231
55176
56166
57113
58119
5974
6062
6136
6229
6313
6421
651
6614
6772
68188
69347
70545
71680
72861

[1,1,1,2,1,4,2,3,1,6,8,8,7,3,5,1,8,18,21,28,17,23,
 14,11,5,8,1,10,32,50,73,73,77,79,58,57,44,39,22,
 18,8,13,1,12,50,103,166,221,238,289,256,269,226,
 231,176,166,113,119,74,62,36,29,13,21,1,14,72,188,
 347,545,680,861]