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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”).

A146777 as a simple table

na(n)
11
21
31
41
51
61
71
81
917
1017
1149
1249
13205
14205
153001
163001
1766003
1866003
191489297
201489297
2139955495
2239955495

[1,1,1,1,1,1,1,1,17,17,49,49,205,205,3001,3001,
 66003,66003,1489297,1489297,39955495,39955495]