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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”).

A266853 as a simple table

na(n)
11
20
31
444
56850
63070032
73287263919
85468455977296

[1,0,1,44,6850,3070032,3287263919,5468455977296]