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A059424 Number of negative terms in a symmetric determinant of order n. 2
0, 0, 1, 3, 9, 35, 195, 1218, 9184, 75492, 724995, 7428905, 86414559, 1059030297, 14455096201, 206132138310, 3228219898080, 52501425954872, 927663133292361, 16944154401198843, 333387373140423145, 6756756713150677275, 146490980301083247291 (list; graph; refs; listen; history; text; internal format)
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 * A002575 A125792 A223310

Adjacent sequences:  A059421 A059422 A059423 * A059425 A059426 A059427

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 30 2001

STATUS

approved

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Last modified November 22 05:52 EST 2018. Contains 317453 sequences. (Running on oeis4.)