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A118995 Number of real n X n symmetric (+1,-1) matrices with positive permanent. 3
1, 4, 32, 592, 11904, 1192384, 134217728 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Cf. A086900, A118994, A118999.

Sequence in context: A219149 A013041 A006024 * A222829 A134087 A132854

Adjacent sequences:  A118992 A118993 A118994 * A118996 A118997 A118998

KEYWORD

nonn,more

AUTHOR

Giovanni Resta, May 08 2006

STATUS

approved

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Last modified November 19 00:12 EST 2018. Contains 317332 sequences. (Running on oeis4.)