This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A119002 #25 Jun 18 2025 06:11:56
%S A119002 1,1,1,2,3,5,9,18,56,144,320
%N A119002 Maximal determinant of real n X n symmetric (0,1) matrices.
%C A119002 The determinant of this 8 X 8 matrix is a(8) = 56:
%C A119002 {0, 1, 1, 1, 0, 1, 0, 0},
%C A119002 {1, 0, 1, 1, 0, 1, 0, 0},
%C A119002 {1, 1, 0, 1, 0, 0, 1, 1},
%C A119002 {1, 1, 1, 0, 1, 0, 0, 1},
%C A119002 {0, 0, 0, 1, 1, 1, 0, 1},
%C A119002 {1, 1, 0, 0, 1, 1, 1, 0},
%C A119002 {0, 0, 1, 0, 0, 1, 1, 1},
%C A119002 {0, 0, 1, 1, 1, 0, 1, 0}
%C A119002 and the determinant of this 9 X 9 matrix is a(9) = 144:
%C A119002 {1, 1, 0, 1, 1, 0, 0, 1, 1},
%C A119002 {1, 1, 1, 1, 0, 1, 0, 0, 0},
%C A119002 {0, 1, 1, 1, 0, 0, 1, 1, 1},
%C A119002 {1, 1, 1, 0, 1, 0, 1, 0, 1},
%C A119002 {1, 0, 0, 1, 0, 1, 1, 0, 1},
%C A119002 {0, 1, 0, 0, 1, 1, 1, 1, 0},
%C A119002 {0, 0, 1, 1, 1, 1, 0, 0, 1},
%C A119002 {1, 0, 1, 0, 0, 1, 0, 1, 1},
%C A119002 {1, 0, 1, 1, 1, 0, 1, 1, 0}. - _Jean-François Alcover_, Nov 18 2017
%H A119002 <a href="/index/De#determinants">Index entries for sequences related to maximal determinants</a>
%F A119002 a(n) <= A003432(n).
%Y A119002 Cf. A003432, A119003, A119004, A118998.
%K A119002 nonn,more
%O A119002 0,4
%A A119002 _Giovanni Resta_, May 08 2006
%E A119002 a(8) and a(9) from _Jean-François Alcover_, Nov 18 2017
%E A119002 a(0)=1 prepended by _Alois P. Heinz_, Nov 18 2017
%E A119002 a(10) from _Max Alekseyev_, Jun 17 2025