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A047596 as a simple table

na(n)
12
23
34
45
510
611
712
813
918
1019
1120
1221
1326
1427
1528
1629
1734
1835
1936
2037
2142
2243
2344
2445
2550
2651
2752
2853
2958
3059
3160
3261
3366
3467
3568
3669
3774
3875
3976
4077
4182
4283
4384
4485
4590
4691
4792
4893
4998
5099
51100
52101
53106
54107
55108
56109
57114
58115
59116
60117
61122
62123

[2,3,4,5,10,11,12,13,18,19,20,21,26,27,28,29,34,
 35,36,37,42,43,44,45,50,51,52,53,58,59,60,61,66,
 67,68,69,74,75,76,77,82,83,84,85,90,91,92,93,98,
 99,100,101,106,107,108,109,114,115,116,117,122,
 123]