Number of symmetric real invertible (0,1) n X n matrices with (-1,0,1) inverses.
A080636
Number of symmetric real invertible (0,1) n X n matrices with (-1,0,1) inverses.
Terms
- a(0) =1a(1) =4a(2) =28a(3) =334a(4) =7906a(5) =288676a(6) =18863944
External references
- oeis: A080636