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%I #21 Nov 20 2017 08:53:09
%S 1,1,1,2,3,5,9,18,56,144
%N Maximal determinant of real n X n symmetric (0,1) matrices.
%C The determinant of this 8 X 8 matrix is a(8) = 56:
%C {0, 1, 1, 1, 0, 1, 0, 0},
%C {1, 0, 1, 1, 0, 1, 0, 0},
%C {1, 1, 0, 1, 0, 0, 1, 1},
%C {1, 1, 1, 0, 1, 0, 0, 1},
%C {0, 0, 0, 1, 1, 1, 0, 1},
%C {1, 1, 0, 0, 1, 1, 1, 0},
%C {0, 0, 1, 0, 0, 1, 1, 1},
%C {0, 0, 1, 1, 1, 0, 1, 0}
%C and the determinant of this 9 X 9 matrix is a(9) = 144:
%C {1, 1, 0, 1, 1, 0, 0, 1, 1},
%C {1, 1, 1, 1, 0, 1, 0, 0, 0},
%C {0, 1, 1, 1, 0, 0, 1, 1, 1},
%C {1, 1, 1, 0, 1, 0, 1, 0, 1},
%C {1, 0, 0, 1, 0, 1, 1, 0, 1},
%C {0, 1, 0, 0, 1, 1, 1, 1, 0},
%C {0, 0, 1, 1, 1, 1, 0, 0, 1},
%C {1, 0, 1, 0, 0, 1, 0, 1, 1},
%C {1, 0, 1, 1, 1, 0, 1, 1, 0}. - _Jean-François Alcover_, Nov 18 2017
%H <a href="/index/De#determinants">Index entries for sequences related to maximal determinants</a>
%F a(n) <= A003432(n).
%Y Cf. A003432, A119003, A119004, A118998.
%K nonn,more
%O 0,4
%A _Giovanni Resta_, May 08 2006
%E a(8) and a(9) from _Jean-François Alcover_, Nov 18 2017
%E a(0)=1 prepended by _Alois P. Heinz_, Nov 18 2017
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