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A118993
Number of real n X n symmetric (+1,-1) matrices with nonzero permanent.
1
2, 4, 64, 832, 23808, 1725952, 268435456
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Cf.
A086899
,
A119010
.
Sequence in context:
A275203
A232444
A088079
*
A219735
A279969
A361228
Adjacent sequences:
A118990
A118991
A118992
*
A118994
A118995
A118996
KEYWORD
nonn
,
more
AUTHOR
Giovanni Resta
, May 08 2006
STATUS
approved
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Last modified July 19 05:59 EDT 2024. Contains 374389 sequences. (Running on oeis4.)