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A218890 as a simple table

na(n)
11
22
33
46
55
64
710
89
98
107
1111
1212
1313
1414
1515
1616
1717
1818
1919
2020
2121
2228
2327
2426
2525
2624
2723
2822
2936
3035
3134
3233
3332
3431
3530
3629
3737
3838
3939
4040
4141
4242
4343
4444
4545
4646
4747
4848
4949
5050
5151
5252
5353
5454
5555
5666
5765
5864
5963
6062
6161
6260
6359
6458
6557
6656
6778

[1,2,3,6,5,4,10,9,8,7,11,12,13,14,15,16,17,18,19,
 20,21,28,27,26,25,24,23,22,36,35,34,33,32,31,30,
 29,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
 52,53,54,55,66,65,64,63,62,61,60,59,58,57,56,78]