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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”).

A147200 as a simple table

na(n)
11
21
31
41
51
65
713
845
9141
10593
112479
1213149
1373679
14588757
155000629
1656709831
17657094563

[1,1,1,1,1,5,13,45,141,593,2479,13149,73679,
 588757,5000629,56709831,657094563]