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A306866 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1112
1211
1313
1414
1515
1616
1717
1818
1920
2019
2121
2223
2324
2422
2525
2626
2728
2827
2929
3030
3131
3232
3333
3434
3536
3635
3737
3839
3940
4038
4141
4247
4345
4443
4549
4646
4742
4850
4944
5048
5151
5252
5356
5454
5557
5653
5755
5858
5960
6059
6161
6262
6363
6464
6565
6666
6768

[1,2,3,4,5,6,7,8,9,10,12,11,13,14,15,16,17,18,20,
 19,21,23,24,22,25,26,28,27,29,30,31,32,33,34,36,
 35,37,39,40,38,41,47,45,43,49,46,42,50,44,48,51,
 52,56,54,57,53,55,58,60,59,61,62,63,64,65,66,68]