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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”).

A202761 as a simple table

na(n)
11
27
318
4146
52128
628764
71064140
859594272
94526156600

[1,7,18,146,2128,28764,1064140,59594272,
 4526156600]