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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”).

A299683 as a simple table

na(n)
11
24
315
4648
523116
65740433
74582634341
89172624830461
966764212816377961

[1,4,15,648,23116,5740433,4582634341,
 9172624830461,66764212816377961]