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A028776 as a simple table

na(n)
12
23
35
46
58
610
711
812
913
1014
1115
1217
1319
1420
1521
1623
1724
1826
1927
2029
2130
2231
2332
2433
2534
2635
2738
2839
2940
3041
3142
3244
3345
3447
3548
3650
3751
3852
3953
4054
4155
4256
4357
4459
4560
4661
4762

[2,3,5,6,8,10,11,12,13,14,15,17,19,20,21,23,24,26,
 27,29,30,31,32,33,34,35,38,39,40,41,42,44,45,47,
 48,50,51,52,53,54,55,56,57,59,60,61,62]