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A226721 as a simple table

na(n)
12
23
35
46
58
69
711
812
913
1015
1116
1218
1319
1421
1522
1623
1725
1826
1928
2029
2131
2232
2333
2435
2536
2638
2739
2841
2942
3043
3145
3246
3348
3449
3551
3652
3753
3855
3956
4058
4159
4261
4362
4463
4565
4666
4768
4869
4971
5072
5173
5275
5376
5478
5579
5681
5782
5883
5985
6086
6188
6289
6391
6492
6593
6695

[2,3,5,6,8,9,11,12,13,15,16,18,19,21,22,23,25,26,
 28,29,31,32,33,35,36,38,39,41,42,43,45,46,48,49,
 51,52,53,55,56,58,59,61,62,63,65,66,68,69,71,72,
 73,75,76,78,79,81,82,83,85,86,88,89,91,92,93,95]