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A020904 as a simple table

na(n)
12
24
37
49
511
613
716
818
922
1024
1127
1229
1331
1434
1537
1639
1742
1844
1946
2048
2151
2253
2356
2458
2561
2663
2765
2867
2969
3072
3174
3276
3379
3481
3584
3686
3788
3890
3992
4094
4197
4299
43101
44103
45106
46108
47111
48113
49115
50117
51121
52123
53126
54128
55130
56132
57135
58137
59139
60142

[2,4,7,9,11,13,16,18,22,24,27,29,31,34,37,39,42,
 44,46,48,51,53,56,58,61,63,65,67,69,72,74,76,79,
 81,84,86,88,90,92,94,97,99,101,103,106,108,111,
 113,115,117,121,123,126,128,130,132,135,137,139,
 142]