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%I #8 Dec 30 2023 23:47:40
%S 1,0,2,31,1781,58180
%N a(n) is the maximal determinant of an n X n Hankel matrix using the integers 0 to 2*(n - 1).
%C a(6) >= 2189560.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Hankel_matrix">Hankel matrix</a>.
%e a(2) = 2:
%e 2, 0;
%e 0, 1.
%e a(3) = 31:
%e 1, 4, 2;
%e 4, 2, 3;
%e 2, 3, 0.
%e a(4) = 1781:
%e 1, 2, 5, 6;
%e 2, 5, 6, 0;
%e 5, 6, 0, 4;
%e 6, 0, 4, 3.
%Y Cf. A368353 (minimal), A368355 (maximal absolute value).
%Y Cf. A358569 (minimal permanent), A358570 (maximal permanent).
%K nonn,hard,more
%O 0,3
%A _Stefano Spezia_, Dec 22 2023