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A166749 as a simple table

na(n)
10
24
318
427
549
672
781
894
9499
10994
114999
129994
1349999
1499994
15499999
16999994
174999999
189999994
1949999999
2099999994
21499999999
22999999994
234999999999
249999999994
2549999999999
2699999999994
27499999999999
28999999999994
294999999999999
309999999999994
3149999999999999

[0,4,18,27,49,72,81,94,499,994,4999,9994,49999,
 99994,499999,999994,4999999,9999994,49999999,
 99999994,499999999,999999994,4999999999,
 9999999994,49999999999,99999999994,499999999999,
 999999999994,4999999999999,9999999999994,
 49999999999999]