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A081031 as a simple table

na(n)
11
23
34
46
58
69
711
813
915
1016
1118
1220
1321
1423
1525
1627
1728
1830
1932
2033
2135
2237
2339
2440
2542
2644
2745
2847
2949
3051
3152
3254
3356
3457
3559
3661
3763
3864
3966
4068
4169
4271
4373
4475
4576
4678
4780
4881
4983
5085
5187
5288

[1,3,4,6,8,9,11,13,15,16,18,20,21,23,25,27,28,30,
 32,33,35,37,39,40,42,44,45,47,49,51,52,54,56,57,
 59,61,63,64,66,68,69,71,73,75,76,78,80,81,83,85,
 87,88]