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A180738 as a simple table

na(n)
18
20
3512
48000
574088
6804357
78000000
874088000
9804357000
109474296896
1199832769119
12999100269973
139970304382667
1499910262316808
15999100269973000
169981565340125231
1799912200160380167
18999100269973000000

[8,0,512,8000,74088,804357,8000000,74088000,
 804357000,9474296896,99832769119,999100269973,
 9970304382667,99910262316808,999100269973000,
 9981565340125231,99912200160380167,
 999100269973000000]