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A321818 as a simple table

na(n)
11
2256
36562
465536
5390626
61679872
75764802
816777216
943053283
10100000256
11214358882
12430047232
13815730722
141475789312
152563287812
164294967296
176975757442
1811021640448
1916983563042
2025600065536
2137828630724
2254875873792
2378310985282

[1,256,6562,65536,390626,1679872,5764802,16777216,
 43053283,100000256,214358882,430047232,815730722,
 1475789312,2563287812,4294967296,6975757442,
 11021640448,16983563042,25600065536,37828630724,
 54875873792,78310985282]