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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”).

A239778 as a simple table

na(n)
01
11
212
3255
48968
5452485
631456656
72899786855
8343386848064

[1,1,12,255,8968,452485,31456656,2899786855,
 343386848064]