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A238933 as a simple table

na(n)
1540
2176224
322636472
42531484558
5330899764092
645110351036260
76073850637262806
8810496773508386224
9108127360707006003716
1014442654537530496784878
111929809100292543309059168

[540,176224,22636472,2531484558,330899764092,
 45110351036260,6073850637262806,
 810496773508386224,108127360707006003716,
 14442654537530496784878,1929809100292543309059168]