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A288938 as a simple table

na(n)
13
26
37
49
510
612
713
814
916
1017
1118
1219
1321
1422
1523
1624
1725
1827
1928
2029
2130
2231
2332
2434
2535
2636
2737
2838
2939
3040
3142
3243
3344
3445
3546
3647
3748
3849
3951
4052
4153
4254
4355
4456
4557
4658
4759
4861
4962
5063
5164
5265
5366
5467
5568
5669
5770
5872
5973
6074
6175
6276
6377
6478
6579
6680

[3,6,7,9,10,12,13,14,16,17,18,19,21,22,23,24,25,
 27,28,29,30,31,32,34,35,36,37,38,39,40,42,43,44,
 45,46,47,48,49,51,52,53,54,55,56,57,58,59,61,62,
 63,64,65,66,67,68,69,70,72,73,74,75,76,77,78,79,
 80]