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A250376 as a simple table

na(n)
1252
27168
369984
4396745
51616636
65272892
714647808
836038649
980620540
10167049696
11324977632
12599664273
131057895164
141795425260
152946189056
164693534097
177283752188
1811042199904
1916392317280
2023877870841
2134188764412

[252,7168,69984,396745,1616636,5272892,14647808,
 36038649,80620540,167049696,324977632,599664273,
 1057895164,1795425260,2946189056,4693534097,
 7283752188,11042199904,16392317280,23877870841,
 34188764412]