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A231923 as a simple table

na(n)
00
15
21
34
416
56
62
78
817
910
103
117
1213
1319
1412
1520
1615
1721
189
1918
2024
2133
2236
2364
2426
2531
2638
2741
2855
2961
3065
3122
3211
3314
3423
3529
3643
3746
3848
3953
4058
4163
4267
4327
4430
4539
4645
4754
4857
4966
5025
5132
5237
5342
5447
5559
5662
5768
5834
5940
6051
6160
6269
6328
6449
6552
6671
6735
6844
6950

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