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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”).

A146615 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
137
147
1521
1621
1749
1849
19235
20235
211289
221289
239339

[1,1,1,1,1,1,1,1,1,1,1,1,7,7,21,21,49,49,235,235,
 1289,1289,9339]