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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”).

A207158 as a simple table

na(n)
11
27
318
483
5883
68004
7137386
83684780
9120845236
106910251668

[1,7,18,83,883,8004,137386,3684780,120845236,
 6910251668]