A059423 Number of positive terms in a symmetric determinant of order n.

1, 1, 1, 2, 8, 38, 193, 1243, 8971, 77039, 711719, 7557974, 85038784, 1075040038, 14252911927, 208885729397, 3187988600057, 53129157538097, 917244939572929, 17127419083026706, 329981266766790136, 6823452191056396526, 145118585159785011041

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. A059424.

Sequence in context: A002003 A123164 A264229 * A112109 A345178 A026939

Adjacent sequences: A059420 A059421 A059422 * A059424 A059425 A059426

Keyword

nonn

Author

N. J. A. Sloane, Jan 30 2001

Status

approved