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A059423 Number of positive terms in a symmetric determinant of order n. 2
1, 1, 1, 2, 8, 38, 193, 1243, 8971, 77039, 711719, 7557974, 85038784, 1075040038, 14252911927, 208885729397, 3187988600057, 53129157538097, 917244939572929, 17127419083026706, 329981266766790136, 6823452191056396526, 145118585159785011041 (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. A059424.

Sequence in context: A123164 A002003 A264229 * A112109 A026939 A291088

Adjacent sequences:  A059420 A059421 A059422 * A059424 A059425 A059426

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 30 2001

STATUS

approved

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Last modified November 15 03:34 EST 2018. Contains 317224 sequences. (Running on oeis4.)