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

0,4

References

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

Links

Table of n, a(n) for n=0..22.

Crossrefs

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

Sequence in context: A000834 A005346 A129094 * A354239 A002575 A125792

Adjacent sequences: A059421 A059422 A059423 * A059425 A059426 A059427

Keyword

nonn

Author

N. J. A. Sloane, Jan 30 2001

Status

approved