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A121229 as a simple table

na(n)
11
22
33
44
55
67
78
89
910
1011
1113
1214
1315
1416
1517
1618
1719
1821
1922
2023
2124
2225
2326
2427
2528
2629
2730
2831
2932
3033
3134
3236
3337
3438
3539
3640
3741
3842
3943
4044
4145
4246
4347
4448
4549
4650
4751
4852
4953
5054
5155
5257
5358
5459
5560
5661
5762
5863
5964
6065
6166
6267
6368
6469
6570
6671
6773
6874
6975
7076
7177
7278

[1,2,3,4,5,7,8,9,10,11,13,14,15,16,17,18,19,21,22,
 23,24,25,26,27,28,29,30,31,32,33,34,36,37,38,39,
 40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,
 57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,73,
 74,75,76,77,78]