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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”).

A147427 as a simple table

na(n)
11
21
31
41
55
613
725
849
9161
10793
114845
1227471
13158415
141126745
159283892

[1,1,1,1,5,13,25,49,161,793,4845,27471,158415,
 1126745,9283892]