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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A015871 as a simple table

na(n)
11
24
39
416
518
664
781
8729
94096
1059049
11125316
12262144
1316777216

[1,4,9,16,18,64,81,729,4096,59049,125316,262144,
 16777216]