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A284681 as a simple table

na(n)
12
23
34
49
510
611
713
814
915
1017
1118
1219
1321
1422
1523
1628
1729
1830
1935
2036
2137
2242
2343
2444
2549
2650
2751
2853
2954
3055
3157
3258
3359
3461
3562
3663
3768
3869
3970
4072
4173
4274
4376
4477
4578
4680
4781
4882
4987
5088
5189
5291
5392
5493
5595
5696
5797
5899
59100
60101
61106
62107
63108
64110

[2,3,4,9,10,11,13,14,15,17,18,19,21,22,23,28,29,
 30,35,36,37,42,43,44,49,50,51,53,54,55,57,58,59,
 61,62,63,68,69,70,72,73,74,76,77,78,80,81,82,87,
 88,89,91,92,93,95,96,97,99,100,101,106,107,108,
 110]