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A218889 as a simple table

na(n)
13
28
312
4243
5729
64096
765536
82097152
98388608
10268435456
11536870912
1268719476736
13274877906944

[3,8,12,243,729,4096,65536,2097152,8388608,
 268435456,536870912,68719476736,274877906944]