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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”).

A364404 as a simple table

na(n)
10
20
30
40
51
64
729
8186
91435
1012671
11131820
121590900
1321940512
14339723835

[0,0,0,0,1,4,29,186,1435,12671,131820,1590900,
 21940512,339723835]