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a(n) is the maximal permanent of an n X n matrix using the integers 0 to n^2 - 1.
2

%I #7 Nov 19 2022 20:28:18

%S 1,0,6,553,107140,40179728,27312009708

%N a(n) is the maximal permanent of an n X n matrix using the integers 0 to n^2 - 1.

%e a(3) = 553:

%e [1, 2, 8;

%e 7, 5, 0;

%e 4, 6, 3]

%Y Cf. A350566 (integers 1 to n^2), A358486 (minimal).

%K nonn,hard,more

%O 0,3

%A _Stefano Spezia_, Nov 18 2022

%E a(4)-a(6) from _Hugo Pfoertner_, Nov 19 2022