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A028789 as a simple table

na(n)
12
23
36
47
58
610
711
812
913
1014
1115
1218
1319
1421
1522
1623
1726
1827
1929
2030
2131
2232
2333
2434
2535
2637
2738
2839
2940
3041
3142
3243
3346
3447
3548
3650
3751
3852
3953
4054
4155
4256
4358
4459
4560
4662
4763
4865
4966
5067
5169
5270
5371
5472
5574
5675

[2,3,6,7,8,10,11,12,13,14,15,18,19,21,22,23,26,27,
 29,30,31,32,33,34,35,37,38,39,40,41,42,43,46,47,
 48,50,51,52,53,54,55,56,58,59,60,62,63,65,66,67,
 69,70,71,72,74,75]