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A338618 as a simple table

na(n)
11
22
34
43
56
65
78
810
97
1012
119
1211
1315
1418
1513
1614
1716
1817
1920
2022
2119
2224
2321
2423
2527
2630
2725
2826
2928
3029
3132
3234
3331
3436
3533
3635
3739
3840
3938
4037
4142
4244
4341
4446
4548
4643
4745
4850
4947
5052
5154
5249
5351
5456
5557
5658
5760
5853
5955
6065
6159
6270
6362
6461
6564
6666
6763

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