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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”).

A303507 as a simple table

na(n)
11
28
378
41596
572890
68883058
72346396384
81203039901394
91490405412540557

[1,8,78,1596,72890,8883058,2346396384,
 1203039901394,1490405412540557]