cp's OEIS Frontend

A374280 a(n) is the maximal determinant of an n X n symmetric Toeplitz matrix having 0 on the main diagonal and all the integers 1, 2, ..., n-1 off-diagonal.

%I A374280 #14 Jul 07 2024 05:46:00
%S A374280 1,0,-1,8,28,282,27495,581268,17344692,1246207300,33366771123
%N A374280 a(n) is the maximal determinant of an n X n symmetric Toeplitz matrix having 0 on the main diagonal and all the integers 1, 2, ..., n-1 off-diagonal.
%H A374280 Wikipedia, <a href="https://en.wikipedia.org/wiki/Toeplitz_matrix">Toeplitz Matrix</a>.
%e A374280 a(5) = 282:
%e A374280   [0, 3, 4, 2, 1]
%e A374280   [3, 0, 3, 4, 2]
%e A374280   [4, 3, 0, 3, 4]
%e A374280   [2, 4, 3, 0, 3]
%e A374280   [1, 2, 4, 3, 0]
%t A374280 a[0]=1; a[n_]:=Max[Table[Det[ToeplitzMatrix[Join[{0},Part[Permutations[Range[n-1]],i]]]],{i,(n-1)!}]]; Array[a,11,0]
%Y A374280 Cf. A085750, A358324.
%Y A374280 Cf. A085807 (minimal permanent), A374279 (minimal), A374281 (maximal absolute value), A374282 (minimal nonzero absolute value), A374283 (maximal permanent).
%K A374280 sign,hard,more
%O A374280 0,4
%A A374280 _Stefano Spezia_, Jul 02 2024