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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”).

A300261 as a simple table

na(n)
11
28
395
42030
5138215
620341795
76717267728
86293324571337
914961844070607631

[1,8,95,2030,138215,20341795,6717267728,
 6293324571337,14961844070607631]