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A120515 as a simple table

na(n)
11
23
34
47
58
69
711
812
913
1017
1118
1219
1321
1422
1523
1625
1726
1827
1930
2031
2132
2234
2335
2436
2538
2639
2740
2845
2946
3047
3149
3250
3351
3453
3554
3655
3758
3859
3960
4062
4163
4264
4366
4467
4568
4671
4772
4873
4975
5076

[1,3,4,7,8,9,11,12,13,17,18,19,21,22,23,25,26,27,
 30,31,32,34,35,36,38,39,40,45,46,47,49,50,51,53,
 54,55,58,59,60,62,63,64,66,67,68,71,72,73,75,76]