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A033125 as a simple table

na(n)
11
27
350
4351
52457
617200
7120401
8842807
95899650
1041297551
11289082857
122023580000
1314165060001
1499155420007
15694087940050
164858615580351
1734010309062457
18238072163437200
191666505144060401
2011665536008422807
2181658752058959650
22571611264412717551

[1,7,50,351,2457,17200,120401,842807,5899650,
 41297551,289082857,2023580000,14165060001,
 99155420007,694087940050,4858615580351,
 34010309062457,238072163437200,1666505144060401,
 11665536008422807,81658752058959650,
 571611264412717551]