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A246594 as a simple table

na(n)
00
11
22
33
44
56
66
77
88
910
1012
1113
1212
1314
1414
1515
1616
1718
1820
1921
2024
2125
2226
2327
2424
2526
2628
2729
2828
2930
3030
3131
3232
3334
3436
3537
3640
3741
3842
3943
4048
4149
4250
4351
4452
4553
4654
4755
4848
4950
5052
5153
5256
5357
5458
5559
5656
5758
5860
5961
6060
6162
6262
6363
6464
6566
6668

[0,1,2,3,4,6,6,7,8,10,12,13,12,14,14,15,16,18,20,
 21,24,25,26,27,24,26,28,29,28,30,30,31,32,34,36,
 37,40,41,42,43,48,49,50,51,52,53,54,55,48,50,52,
 53,56,57,58,59,56,58,60,61,60,62,62,63,64,66,68]