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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”).

A299091 as a simple table

na(n)
11
27
320
4125
52828
642012
72170819
8161247816
920536604982
105567500327979

[1,7,20,125,2828,42012,2170819,161247816,
 20536604982,5567500327979]