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A028778 as a simple table

na(n)
12
23
35
46
57
68
711
812
913
1015
1117
1218
1319
1420
1521
1622
1723
1824
1927
2028
2131
2232
2333
2434
2537
2638
2741
2842
2943
3044
3145
3246
3347
3448
3550
3652
3753
3854
3957
4058
4159
4260
4362
4463

[2,3,5,6,7,8,11,12,13,15,17,18,19,20,21,22,23,24,
 27,28,31,32,33,34,37,38,41,42,43,44,45,46,47,48,
 50,52,53,54,57,58,59,60,62,63]