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A358808 a(n) is the minimal permanent of an n X n symmetric matrix using all the integers from 0 to n*(n + 1)/2 - 1.

%I A358808 #14 Dec 07 2022 08:57:58
%S A358808 1,0,1,33,2425,357046,92052610
%N A358808 a(n) is the minimal permanent of an n X n symmetric matrix using all the integers from 0 to n*(n + 1)/2 - 1.
%e A358808 a(2) = 1:
%e A358808     [0, 1;
%e A358808      1, 2]
%e A358808 a(3) = 33:
%e A358808     [0, 1, 2;
%e A358808      1, 3, 4;
%e A358808      2, 4, 5]
%e A358808 a(4) = 2425:
%e A358808   [0, 2, 3, 1;
%e A358808    2, 8, 7, 4;
%e A358808    3, 7, 9, 6;
%e A358808    1, 4, 6, 5]
%Y A358808 Cf. A000217, A351153, A351610.
%Y A358808 Cf. A358806 (minimal determinant), A358807 (maximal determinant), A358809 (maximal).
%K A358808 nonn,hard,more
%O A358808 0,4
%A A358808 _Stefano Spezia_, Dec 02 2022
%E A358808 a(4) corrected and a(5)-a(6) from _Hugo Pfoertner_, Dec 07 2022