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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”).

A181920 as a simple table

na(n)
11
22
325
490
5456
6608
71421
81469

[1,2,25,90,456,608,1421,1469]