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A272978 as a simple table

na(n)
11
22
33
44
55
67
78
89
910
1011
1112
1213
1314
1415
1516
1617
1718
1819
1920
2021
2122
2223
2324
2425
2526
2627
2729
2830
2931
3032
3133
3235
3336
3437
3538
3639
3740
3841
3942
4043
4144
4245
4346
4447
4548
4649
4750
4851
4952
5053
5154
5255
5356
5457
5558
5659
5760
5861
5962
6063
6164
6265
6366
6467
6568
6669
6770
6871
6972
7073
7174
7275
7376
7477
7578
7679
7780

[1,2,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
 21,22,23,24,25,26,27,29,30,31,32,33,35,36,37,38,
 39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,
 55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,
 71,72,73,74,75,76,77,78,79,80]