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A118999
Number of real n X n symmetric (+1,-1) matrices with negative permanent.
2
0, 0, 32, 240, 11904, 533568, 134217728
OFFSET
1,3
CROSSREFS
Sequence in context: A250748 A333268 A060622 * A321829 A111450 A351193
KEYWORD
nonn,more
AUTHOR
Giovanni Resta, May 08 2006
STATUS
approved