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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”).

A218226 as a simple table

na(n)
11
215
3497
463309
532362849
666220959971
7542011629493301
817745059393526510913
92323828045898042282454885

[1,15,497,63309,32362849,66220959971,
 542011629493301,17745059393526510913,
 2323828045898042282454885]