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A114861 as a simple table

na(n)
12
21
34
43
57
65
76
811
98
109
1110
1213
1312
1417
1514
1615
1716
1819
1918
2023
2120
2221
2322
2425
2524
2629
2726
2827
2928
3031
3130
3237
3332
3433
3534
3635
3736
3841
3938
4039
4140
4243
4342
4447
4544
4645
4746
4849
4948
5053
5150
5251
5352
5455
5554
5659
5756
5857
5958
6061
6160
6267
6362
6463
6564
6665
6766
6871
6968
7069
7170
7273

[2,1,4,3,7,5,6,11,8,9,10,13,12,17,14,15,16,19,18,
 23,20,21,22,25,24,29,26,27,28,31,30,37,32,33,34,
 35,36,41,38,39,40,43,42,47,44,45,46,49,48,53,50,
 51,52,55,54,59,56,57,58,61,60,67,62,63,64,65,66,
 71,68,69,70,73]