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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”).

A146788 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
139
149
1527
1627
1785
1885
19337
20337
211791
221791

[1,1,1,1,1,1,1,1,1,1,3,3,9,9,27,27,85,85,337,337,
 1791,1791]