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A166515 as a simple table

na(n)
00
11
22
32
44
55
68
78
812
913
1018
1118
1224
1325
1432
1532
1640
1741
1850
1950
2060
2161
2272
2372
2484
2585
2698
2798
28112
29113
30128
31128
32144
33145
34162
35162
36180
37181
38200
39200
40220
41221
42242
43242
44264
45265
46288
47288
48312
49313
50338
51338
52364
53365
54392
55392
56420
57421
58450
59450
60480

[0,1,2,2,4,5,8,8,12,13,18,18,24,25,32,32,40,41,50,
 50,60,61,72,72,84,85,98,98,112,113,128,128,144,
 145,162,162,180,181,200,200,220,221,242,242,264,
 265,288,288,312,313,338,338,364,365,392,392,420,
 421,450,450,480]