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A123503 as a simple table

na(n)
00
11
22
33
44
56
65
78
87
99
1010
1114
1216
1319
1411
1515
1612
1721
1822
1913
2020
2117
2218
2323
2424
2525
2626
2727
2837
2938
3042
3144
3247
3351
3453
3556
3660
3728
3829
3939
4043
4152
4230
4340
4431
4558
4659
4732
4862
4963
5064
5133
5241
5334
5457
5561
5635
5754
5845
5946
6036
6155
6248
6349
6450
6565
6666
6767
6868
6969
7070
7171

[0,1,2,3,4,6,5,8,7,9,10,14,16,19,11,15,12,21,22,
 13,20,17,18,23,24,25,26,27,37,38,42,44,47,51,53,
 56,60,28,29,39,43,52,30,40,31,58,59,32,62,63,64,
 33,41,34,57,61,35,54,45,46,36,55,48,49,50,65,66,
 67,68,69,70,71]