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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”).

A147222 as a simple table

na(n)
11
21
31
41
51
621
745
8251
91189
105949
1138111
12398367
133732199

[1,1,1,1,1,21,45,251,1189,5949,38111,398367,
 3732199]