A118993 Number of real n X n symmetric (+1,-1) matrices with nonzero permanent.

2, 4, 64, 832, 23808, 1725952, 268435456

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Crossrefs

Cf. A086899, A119010.

Sequence in context: A364453 A232444 A088079 * A219735 A279969 A361228

Adjacent sequences: A118990 A118991 A118992 * A118994 A118995 A118996

Keyword

nonn,more

Author

Giovanni Resta, May 08 2006

Status

approved