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A128280 as a simple table

na(n)
00
12
21
34
43
58
65
76
87
910
109
1114
1215
1316
1413
1518
1611
1712
1817
1920
2021
2122
2219
2324
2423
2530
2629
2732
2827
2926
3033
3128
3225
3334
3437
3536
3631
3740
3839
3944
4035
4138
4241
4342
4447
4550
4651
4746
4843
4954
5049
5148
5253
5356
5445
5552
5655
5758
5869
5962
6065
6166
6261
6370
6457
6574
6663
6764
6867
6960
7071
7168
7259

[0,2,1,4,3,8,5,6,7,10,9,14,15,16,13,18,11,12,17,
 20,21,22,19,24,23,30,29,32,27,26,33,28,25,34,37,
 36,31,40,39,44,35,38,41,42,47,50,51,46,43,54,49,
 48,53,56,45,52,55,58,69,62,65,66,61,70,57,74,63,
 64,67,60,71,68,59]