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A338240 as a simple table

na(n)
12
23
31
44
55
67
78
89
911
1013
116
1210
1315
1417
1519
1612
1714
1821
1923
2016
2125
2220
2327
2429
2531
2618
2722
2833
2924
3035
3137
3228
3339
3441
3543
3626
3745
3847
3930
4049
4132
4251
4353
4434
4555
4636
4738
4857
4959
5061
5140
5263
5342
5465
5567
5644
5769
5871
5973
6048
6150
6275
6354
6477
6579
6646
6781
6883

[2,3,1,4,5,7,8,9,11,13,6,10,15,17,19,12,14,21,23,
 16,25,20,27,29,31,18,22,33,24,35,37,28,39,41,43,
 26,45,47,30,49,32,51,53,34,55,36,38,57,59,61,40,
 63,42,65,67,44,69,71,73,48,50,75,54,77,79,46,81,
 83]