A059424 Number of negative terms in a symmetric determinant of order n.

0, 0, 1, 3, 9, 35, 195, 1218, 9184, 75492, 724995, 7428905, 86414559, 1059030297, 14455096201, 206132138310, 3228219898080, 52501425954872, 927663133292361, 16944154401198843, 333387373140423145, 6756756713150677275, 146490980301083247291

Offset: 0

Author

N. J. A. Sloane, Jan 30 2001

Keywords

• nonn

References

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

Crossrefs

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