Number of n X n symmetric binary matrices with each 1 adjacent to no more than 2 E, S or NW neighboring 1s.
A191713
Number of n X n symmetric binary matrices with each 1 adjacent to no more than 2 E, S or NW neighboring 1s.
Terms
- a(0) =2a(1) =8a(2) =56a(3) =760a(4) =19792a(5) =978304a(6) =92183968a(7) =16556792256
External references
- oeis: A191713