Number of real n X n symmetric (+1,-1) matrices with nonzero permanent.
A118993
Number of real n X n symmetric (+1,-1) matrices with nonzero permanent.
Terms
- a(0) =2a(1) =4a(2) =64a(3) =832a(4) =23808a(5) =1725952a(6) =268435456a(7) =64638447616
External references
- oeis: A118993