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A031990 as a simple table

na(n)
11
22
33
44
56
67
78
89
912
1013
1114
1218
1319
1424
1531
1632
1733
1834
1937
2038
2139
2243
2344
2449
2562
2663
2764
2868
2969
3074
3193
3294
3399
34124
35156
36157
37158
38159
39162
40163
41164
42168
43169
44174
45187
46188
47189
48193
49194
50199
51218
52219
53224
54249
55312
56313

[1,2,3,4,6,7,8,9,12,13,14,18,19,24,31,32,33,34,37,
 38,39,43,44,49,62,63,64,68,69,74,93,94,99,124,156,
 157,158,159,162,163,164,168,169,174,187,188,189,
 193,194,199,218,219,224,249,312,313]