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A057854 as a simple table

na(n)
15
26
38
49
510
612
713
814
915
1016
1117
1219
1320
1421
1522
1623
1724
1825
1926
2027
2128
2230
2331
2432
2533
2634
2735
2836
2937
3038
3139
3240
3341
3442
3543
3644
3745
3846
3948
4049
4150
4251
4352
4453
4554
4655
4756
4857
4958
5059
5160
5261
5362
5463
5564
5665
5766
5867
5968
6069
6170
6271
6372
6473
6574
6675
6777
6878
6979
7080

[5,6,8,9,10,12,13,14,15,16,17,19,20,21,22,23,24,
 25,26,27,28,30,31,32,33,34,35,36,37,38,39,40,41,
 42,43,44,45,46,48,49,50,51,52,53,54,55,56,57,58,
 59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,
 75,77,78,79,80]