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Maximal sum of inverse squares of the singular values of Toeplitz anti-Hadamard matrices of order n.
2

%I #8 Mar 16 2022 02:52:33

%S 1,3,7,16,46,138,601,2619,16162,93531,654700,4442304

%N Maximal sum of inverse squares of the singular values of Toeplitz anti-Hadamard matrices of order n.

%H R. L. Graham and N. J. A. Sloane, <a href="http://dx.doi.org/10.1016/0024-3795(84)90090-9">Anti-Hadamard matrices</a>, Linear Alg. Applic., 62 (1984), 113-137, Table 1.

%Y Cf. A005312, A005313, A351240, A351241.

%K nonn,hard,more

%O 1,2

%A _Stefano Spezia_, Feb 20 2022

%E a(12) confirmed and inserted by _Stefano Spezia_, Mar 16 2022