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A118992 Number of real n X n invertible symmetric (+1,-1) matrices. 1
2, 4, 32, 512, 16896, 1190144, 163899904 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

Cf. A056990, A086899, A056989.A118990.

Sequence in context: A134958 A101460 A304862 * A012509 A062740 A122214

Adjacent sequences:  A118989 A118990 A118991 * A118993 A118994 A118995

KEYWORD

nonn,more

AUTHOR

Giovanni Resta, May 08 2006

STATUS

approved

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Last modified October 18 07:00 EDT 2018. Contains 316307 sequences. (Running on oeis4.)