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A131388 as a simple table

na(n)
11
22
34
43
56
610
78
85
911
107
1112
1219
1314
1422
1516
169
1718
1828
1920
2031
2121
2233
2324
2413
2526
2640
2727
2815
2930
3046
3132
3217
3334
3452
3536
3655
3738
3858
3939
4060
4142
4264
4344
4423
4547
4625
4748
4873
4950
5076
5151
5278
5354
5482
5556
5629
5759
5888
5957
6089
6161
6292
6363
6496
6566
66100
6768
6835
6970
70106
7172
7237

[1,2,4,3,6,10,8,5,11,7,12,19,14,22,16,9,18,28,20,
 31,21,33,24,13,26,40,27,15,30,46,32,17,34,52,36,
 55,38,58,39,60,42,64,44,23,47,25,48,73,50,76,51,
 78,54,82,56,29,59,88,57,89,61,92,63,96,66,100,68,
 35,70,106,72,37]