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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”).

A147146 as a simple table

na(n)
11
21
31
41
53
69
719
867
9271
101339
117503
1248863
13386667
143842993
1545897369
16657696677

[1,1,1,1,3,9,19,67,271,1339,7503,48863,386667,
 3842993,45897369,657696677]