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A087465 as a simple table

na(n)
01
12
23
34
45
57
66
78
810
912
109
1111
1214
1316
1419
1513
1615
1718
1821
1924
2027
2117
2220
2323
2426
2530
2633
2737
2822
2925
3029
3132
3236
3340
3444
3548
3628
3731
3835
3939
4043
4147
4252
4356
4461
4534
4638
4742
4846
4951
5055
5160
5265
5370
5475
5541
5645
5750
5854
5959
6064
6169
6274
6380
6485
6591
6649
6753
6858
6963
7068
7173

[1,2,3,4,5,7,6,8,10,12,9,11,14,16,19,13,15,18,21,
 24,27,17,20,23,26,30,33,37,22,25,29,32,36,40,44,
 48,28,31,35,39,43,47,52,56,61,34,38,42,46,51,55,
 60,65,70,75,41,45,50,54,59,64,69,74,80,85,91,49,
 53,58,63,68,73]