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A164800 as a simple table

na(n)
18
22
31
40
55
64
728
822
918
1028
1125
1224
1335
1434
1544
1654
17125
18124
19135
20134
21144
22154
23235
24234
25244
26254
27354
28444
29454

[8,2,1,0,5,4,28,22,18,28,25,24,35,34,44,54,125,
 124,135,134,144,154,235,234,244,254,354,444,454]