Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 E, SE or S neighboring 1.
A191691
Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 E, SE or S neighboring 1.
Terms
- a(0) =2a(1) =6a(2) =32a(3) =294a(4) =4640a(5) =125338a(6) =5802288a(7) =459958324a(8) =62453890000
External references
- oeis: A191691