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A338243 as a simple table

na(n)
00
11
23
32
44
59
68
77
86
95
1010
1112
1211
1313
1427
1526
1625
1724
1823
1919
2021
2120
2222
2318
2417
2516
2615
2714
2828
2930
3029
3131
3236
3335
3434
3533
3632
3737
3839
3938
4040
4181
4280
4379
4478
4577
4673
4775
4874
4976
5072
5171
5270
5369
5468
5555
5657
5756
5858
5963
6062
6161
6260
6359
6464
6566
6665
6767

[0,1,3,2,4,9,8,7,6,5,10,12,11,13,27,26,25,24,23,
 19,21,20,22,18,17,16,15,14,28,30,29,31,36,35,34,
 33,32,37,39,38,40,81,80,79,78,77,73,75,74,76,72,
 71,70,69,68,55,57,56,58,63,62,61,60,59,64,66,65,
 67]