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A146123 as a simple table

na(n)
51
6540
74120
812188
931000
1067216
11129464
12228136
13375388
14585140
15873076
161256644
171755056
182389288
193182080
204157936
215343124
226765676
238455388
2410443820
2512764296
2615451904

[1,540,4120,12188,31000,67216,129464,228136,
 375388,585140,873076,1256644,1755056,2389288,
 3182080,4157936,5343124,6765676,8455388,10443820,
 12764296,15451904]