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A064598 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
1616
1717
1818
1919
2020
2121
2222
2323
2425
2526
2627
2728
2829
2930
3031
3132
3233
3334
3435
3537
3638
3739
3840
3941
4042
4143
4244
4345
4446
4547
4649
4750
4851
4952
5053
5154
5255
5356
5457
5558
5659
5760
5861
5962
6063
6164
6265
6366
6467
6568
6669
6770
6871
6973
7074
7175
7276

[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
 20,21,22,23,25,26,27,28,29,30,31,32,33,34,35,37,
 38,39,40,41,42,43,44,45,46,47,49,50,51,52,53,54,
 55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,
 71,73,74,75,76]