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A298297 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1011
1113
1215
1317
1419
1521
1623
1725
1826
1928
2029
2130
2232
2333
2435
2536
2637
2739
2840
2942
3043
3144
3246
3347
3449
3550
3651
3753
3854
3956
4057
4158
4260
4361
4463
4564
4665
4767
4868
4970
5071
5172
5274
5375
5477
5578
5679
5781
5883
5984
6086
6187
6288
6390
6492
6594
6695
6797

[1,2,3,4,5,6,7,8,9,11,13,15,17,19,21,23,25,26,28,
 29,30,32,33,35,36,37,39,40,42,43,44,46,47,49,50,
 51,53,54,56,57,58,60,61,63,64,65,67,68,70,71,72,
 74,75,77,78,79,81,83,84,86,87,88,90,92,94,95,97]