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A137621 as a simple table

na(n)
11
22
34
43
56
68
79
85
910
1012
117
1214
1315
1416
1518
1620
1721
1811
1922
2024
2125
2213
2326
2427
2528
2630
2732
2833
2917
3034
3135
3236
3319
3438
3539
3640
3742
3844
3945
4023
4146
4248
4349
4450
4551
4652
4754
4855
4956
5057
5129
5258
5360
5431
5562
5663
5764
5865
5966
6068
6169
6270
6372
6437
6574
6675
6776
6877
6978
7080
7181
7241

[1,2,4,3,6,8,9,5,10,12,7,14,15,16,18,20,21,11,22,
 24,25,13,26,27,28,30,32,33,17,34,35,36,19,38,39,
 40,42,44,45,23,46,48,49,50,51,52,54,55,56,57,29,
 58,60,31,62,63,64,65,66,68,69,70,72,37,74,75,76,
 77,78,80,81,41]