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A340478 as a simple table

na(n)
00
11
23
32
45
54
66
77
812
913
1015
1114
129
138
1410
1511
1620
1721
1823
1922
2017
2116
2218
2319
2424
2525
2627
2726
2829
2928
3030
3131
3251
3350
3448
3549
3654
3755
3853
3952
4063
4162
4260
4361
4458
4559
4657
4756
4839
4938
5036
5137
5234
5335
5433
5532
5643
5742
5840
5941
6046
6147
6245
6344
6489
6588
6690
6791

[0,1,3,2,5,4,6,7,12,13,15,14,9,8,10,11,20,21,23,
 22,17,16,18,19,24,25,27,26,29,28,30,31,51,50,48,
 49,54,55,53,52,63,62,60,61,58,59,57,56,39,38,36,
 37,34,35,33,32,43,42,40,41,46,47,45,44,89,88,90,
 91]