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A118992
Number of real n X n invertible symmetric (+1,-1) matrices.
1
2, 4, 32, 512, 16896, 1190144, 163899904
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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
A336832
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 August 19 07:15 EDT 2024. Contains 375284 sequences. (Running on oeis4.)