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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”).

A266570 as a simple table

na(n)
11
21
35
474
52668
6150836
712011058
81279437414
9175836809388
1030308775142980
116404886614932128

[1,1,5,74,2668,150836,12011058,1279437414,
 175836809388,30308775142980,6404886614932128]