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A131154 as a simple table

na(n)
00
11
22
33
44
55
67
78
86
99
1010
1113
1211
1312
1417
1518
1620
1721
1822
1916
2019
2114
2215
2323
2424
2525
2626
2727
2835
2936
3033
3128
3229
3334
3430
3531
3632
3745
3846
3949
4050
4148
4254
4355
4457
4558
4659
4761
4862
4963
5064
5144
5247
5353
5456
5560
5642
5751
5837
5938
6043
6152
6240
6341
6439
6565
6666
6768
6869
6967
7070
7171

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