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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”).

A378687 as a simple table

na(n)
11
27
331
4142
5676
63380
717300
889853
9469322

[1,7,31,142,676,3380,17300,89853,469322]