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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”).

A264661 as a simple table

na(n)
11
28
3314
420940
53084352
6726042624
7284038382592

[1,8,314,20940,3084352,726042624,284038382592]