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 A119002 Maximal determinant of real n X n symmetric (0,1) matrices. 4
 1, 1, 1, 2, 3, 5, 9, 18, 56, 144 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS The determinant of this 8 X 8 matrix is a(8) = 56:   {0, 1, 1, 1, 0, 1, 0, 0},   {1, 0, 1, 1, 0, 1, 0, 0},   {1, 1, 0, 1, 0, 0, 1, 1},   {1, 1, 1, 0, 1, 0, 0, 1},   {0, 0, 0, 1, 1, 1, 0, 1},   {1, 1, 0, 0, 1, 1, 1, 0},   {0, 0, 1, 0, 0, 1, 1, 1},   {0, 0, 1, 1, 1, 0, 1, 0} and the determinant of this 9 X 9 matrix is a(9) = 144:   {1, 1, 0, 1, 1, 0, 0, 1, 1},   {1, 1, 1, 1, 0, 1, 0, 0, 0},   {0, 1, 1, 1, 0, 0, 1, 1, 1},   {1, 1, 1, 0, 1, 0, 1, 0, 1},   {1, 0, 0, 1, 0, 1, 1, 0, 1},   {0, 1, 0, 0, 1, 1, 1, 1, 0},   {0, 0, 1, 1, 1, 1, 0, 0, 1},   {1, 0, 1, 0, 0, 1, 0, 1, 1},   {1, 0, 1, 1, 1, 0, 1, 1, 0}. - Jean-François Alcover, Nov 18 2017 LINKS FORMULA a(n) <= A003432(n). CROSSREFS Cf. A003432, A119003, A119004, A118998. Sequence in context: A130581 A051236 A003218 * A058770 A049910 A077643 Adjacent sequences:  A118999 A119000 A119001 * A119003 A119004 A119005 KEYWORD nonn,more AUTHOR Giovanni Resta, May 08 2006 EXTENSIONS a(8) and a(9) from Jean-François Alcover, Nov 18 2017 a(0)=1 prepended by Alois P. Heinz, Nov 18 2017 STATUS approved

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Last modified May 26 22:58 EDT 2020. Contains 334634 sequences. (Running on oeis4.)