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A371976 as a simple table

na(n)
00
11
23
32
45
54
66
77
811
910
108
119
1214
1315
1413
1512
1617
1716
1818
1919
2020
2121
2223
2322
2426
2527
2625
2724
2831
2930
3028
3129
3239
3338
3436
3537
3634
3735
3833
3932
4044
4145
4247
4346
4441
4540
4642
4743
4854
4955
5053
5152
5251
5350
5448
5549
5661
5760
5862
5963
6056
6157
6259
6358
6465
6564
6666
6767

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