Number of n X n symmetric 0..4 arrays with no element equal to the sum or difference mod 5 of any two of its horizontal and vertical neighbors.
A193783
Number of n X n symmetric 0..4 arrays with no element equal to the sum or difference mod 5 of any two of its horizontal and vertical neighbors.
Terms
- a(0) =5a(1) =32a(2) =172a(3) =2836a(4) =91416a(5) =5932132a(6) =772063340a(7) =201054032608
External references
- oeis: A193783