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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”).

A364804 as a simple table

na(n)
11
21
31
41
5121
6121
72521
82521
9162121
10460801
1123553169
1223553169
13244068841
14913535283

[1,1,1,1,121,121,2521,2521,162121,460801,23553169,
 23553169,244068841,913535283]