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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”).

A263540 as a simple table

na(n)
11
21
31
41
51
617
725
837
9265
105
1193
122395
131443
143935
152757
165865

[1,1,1,1,1,17,25,37,265,5,93,2395,1443,3935,2757,
 5865]