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A253996 as a simple table

na(n)
151856
2406183
33678188
430663580
5266574705
62365554897
720976836853
8183417881138
91611843610363
1014153919020809
11124080618908089
121086470007661388
139513144466402410
1483219752120736303
15727529183808379802

[51856,406183,3678188,30663580,266574705,
 2365554897,20976836853,183417881138,1611843610363,
 14153919020809,124080618908089,1086470007661388,
 9513144466402410,83219752120736303,
 727529183808379802]