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A261351 as a simple table

na(n)
11
22
34
43
56
68
75
89
97
1012
1110
1213
1311
1416
1514
1617
1715
1820
1918
2021
2119
2224
2322
2425
2523
2628
2726
2829
2927
3032
3130
3233
3331
3436
3534
3637
3735
3840
3938
4041
4139
4244
4342
4445
4543
4648
4746
4849
4947
5052
5150
5253
5351
5456
5554
5657
5755
5860
5958
6061
6159
6264
6362
6465
6563
6668
6766

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