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A371977 as a simple table

na(n)
00
11
23
32
45
54
66
77
810
911
109
118
1215
1314
1412
1513
1617
1716
1818
1919
2020
2121
2223
2322
2427
2526
2624
2725
2830
2931
3029
3128
3239
3338
3436
3537
3634
3735
3833
3932
4045
4144
4246
4347
4440
4541
4643
4742
4854
4955
5053
5152
5251
5350
5448
5549
5660
5761
5863
5962
6057
6156
6258
6359
6465
6564
6666
6767

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