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A221772 as a simple table

n a(n)
1 55
2 18828
3 6916881
4 2541024755
5 932759231192
6 342291992210642
7 125598125432396157

[55,18828,6916881,2541024755,932759231192,
 342291992210642,125598125432396157]

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Last modified June 24 20:32 EDT 2022. Contains 354830 sequences. (Running on oeis4.)