Number of n X n symmetric binary matrices with each 1 adjacent to exactly 2 king-move neighboring 1s.
A191223
Number of n X n symmetric binary matrices with each 1 adjacent to exactly 2 king-move neighboring 1s.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =16a(4) =88a(5) =534a(6) =4001a(7) =49783a(8) =802282a(9) =16846980a(10) =518093110a(11) =21604679482
External references
- oeis: A191223