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A371960 as a simple table

na(n)
00
11
22
33
44
55
67
76
88
99
1010
1111
1215
1314
1412
1513
1616
1717
1818
1919
2021
2120
2223
2322
2430
2531
2629
2728
2824
2925
3027
3126
3232
3333
3434
3535
3636
3737
3838
3939
4042
4143
4240
4341
4447
4546
4645
4744
4861
4960
5062
5163
5259
5358
5456
5557
5648
5749
5851
5950
6055
6154
6252
6353
6464
6565
6666
6767

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