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Number of negative terms in a symmetric determinant of order n.
2

%I #3 Mar 30 2012 16:49:02

%S 0,0,1,3,9,35,195,1218,9184,75492,724995,7428905,86414559,1059030297,

%T 14455096201,206132138310,3228219898080,52501425954872,

%U 927663133292361,16944154401198843,333387373140423145,6756756713150677275,146490980301083247291

%N Number of negative terms in a symmetric determinant of order n.

%D L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 260, #12, p_n.

%Y (A002135-A059422)/2. Cf. A059423.

%K nonn

%O 0,4

%A _N. J. A. Sloane_, Jan 30 2001