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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”).

A147467 as a simple table

na(n)
11
21
31
45
517
639
7155
81391
919355
10265987
114290113
12107056079
134105155205
14210787717557
1513820630859039

[1,1,1,5,17,39,155,1391,19355,265987,4290113,
 107056079,4105155205,210787717557,13820630859039]