Number of n X n symmetric 0..2 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..2 introduced in lower triangular row major order.
A192996
Number of n X n symmetric 0..2 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..2 introduced in lower triangular row major order.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =6a(4) =35a(5) =530a(6) =10783a(7) =383882a(8) =21009035a(9) =1882728991a(10) =268304587720
External references
- oeis: A192996