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A118990 Number of symmetric singular n X n (+1,-1) matrices over the reals. +0
3
0, 4, 32, 512, 15872, 907008, 104535552 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Cf. A086906, A119010, A057982, A118992.

Sequence in context: A093581 A102557 A140179 this_sequence A036442 A127945 A086899

Adjacent sequences: A118987 A118988 A118989 this_sequence A118991 A118992 A118993

KEYWORD

nonn,more

AUTHOR

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

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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