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A254456 as a simple table

na(n)
16440848
2289945200
314531913928
4623402653056
525559706957728
61041397026476012
741728495959588032
81663022535691018136
966242299786253394624
102638365158866570322184
11105052207003477821889696

[6440848,289945200,14531913928,623402653056,
 25559706957728,1041397026476012,41728495959588032,
 1663022535691018136,66242299786253394624,
 2638365158866570322184,105052207003477821889696]