Number of real n X n symmetric (+1,-1) matrices with negative permanent.
A118999
Number of real n X n symmetric (+1,-1) matrices with negative permanent.
Terms
- a(0) =1a(1) =0a(2) =32a(3) =240a(4) =11904a(5) =533568a(6) =134217728a(7) =22741568512
External references
- oeis: A118999