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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”).

A147166 as a simple table

na(n)
11
21
31
41
51
61
71
81
95
1013
1125
1247
13123
14369
151165
164187
1718445
1879415
19399577
202091817
2112535539
2280500731

[1,1,1,1,1,1,1,1,5,13,25,47,123,369,1165,4187,
 18445,79415,399577,2091817,12535539,80500731]