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A321820 as a simple table

na(n)
11
24096
3531442
416777216
5244140626
62176786432
713841287202
868719476736
9282430067923
101000000004096
113138428376722
128916117225472
1323298085122482
1456693912379392
15129746582562692
16281474976710656
17582622237229762
181156833558212608

[1,4096,531442,16777216,244140626,2176786432,
 13841287202,68719476736,282430067923,
 1000000004096,3138428376722,8916117225472,
 23298085122482,56693912379392,129746582562692,
 281474976710656,582622237229762,1156833558212608]