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A118992 Number of real n X n invertible symmetric (+1,-1) matrices. +0
2
2, 4, 32, 512, 16896, 1190144, 163899904 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Cf. A056990, A086899, A056989.A118990.

Sequence in context: A009110 A134958 A101460 this_sequence A062740 A122214 A122216

Adjacent sequences: A118989 A118990 A118991 this_sequence A118993 A118994 A118995

KEYWORD

nonn,more

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), May 08 2006

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Last modified December 6 11:04 EST 2009. Contains 170427 sequences.

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