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A057509 as a simple table

na(n)
00
11
22
33
44
56
65
77
88
99
1011
1114
1216
1319
1410
1515
1612
1717
1818
1913
2020
2121
2222
2323
2425
2528
2630
2733
2837
2939
3042
3144
3247
3351
3453
3556
3660
3724
3829
3938
4043
4152
4226
4340
4431
4545
4646
4732
4848
4949
5050
5127
5241
5334
5454
5555
5635
5757
5858
5959
6036
6161
6262
6363
6464
6565
6667
6770
6872
6975
7079
7181

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