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A057511 as a simple table

na(n)
00
11
22
33
44
56
65
77
88
99
1011
1114
1216
1319
1410
1515
1612
1717
1820
1913
2018
2121
2222
2323
2425
2528
2630
2733
2837
2939
3042
3144
3253
3351
3447
3556
3660
3724
3829
3938
4043
4152
4226
4340
4431
4545
4648
4734
4854
4957
5061
5127
5241
5332
5446
5555
5635
5749
5858
5962
6036
6150
6259
6363
6464
6565
6667
6770
6872
6975
7079
7181

[0,1,2,3,4,6,5,7,8,9,11,14,16,19,10,15,12,17,20,
 13,18,21,22,23,25,28,30,33,37,39,42,44,53,51,47,
 56,60,24,29,38,43,52,26,40,31,45,48,34,54,57,61,
 27,41,32,46,55,35,49,58,62,36,50,59,63,64,65,67,
 70,72,75,79,81]