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A045790 as a simple table

na(n)
01
12
23
37
45
510
67
720
814
918
1011
1141
1215
1328
1431
1558
1621
1760
1825
1977
2049
2154
2233
23144
2450
2572
2675
27123
2849
29158
3055
31177
3297
33112
3499
35268
3675
37136
38129
39286
4089
41268
4297
43249
44218
45190
46113
47496
48146
49280

[1,2,3,7,5,10,7,20,14,18,11,41,15,28,31,58,21,60,
 25,77,49,54,33,144,50,72,75,123,49,158,55,177,97,
 112,99,268,75,136,129,286,89,268,97,249,218,190,
 113,496,146,280]