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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”).

A099468 as a simple table

na(n)
11
221
345
451
581
6213
7249
8315
9477
10525
11681
12891
131143
141221
151851
161965
172415
185133

[1,21,45,51,81,213,249,315,477,525,681,891,1143,
 1221,1851,1965,2415,5133]