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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”).

A000794 as a simple table

na(n)
11
22
324
43852
518534400
64598378639550

[1,2,24,3852,18534400,4598378639550]