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A254493 as a simple table

na(n)
119456
2281024
33912576
451322752
5656964096
68552031360
7111699091200
81451408273792
918855945794560
10244993609733760
113183443990624512
1241382824034966400
13538020003594157568
146993611458624561280

[19456,281024,3912576,51322752,656964096,
 8552031360,111699091200,1451408273792,
 18855945794560,244993609733760,3183443990624512,
 41382824034966400,538020003594157568,
 6993611458624561280]