Number of n X n 0..1 arrays with every element unequal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
A303889
Number of n X n 0..1 arrays with every element unequal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =7a(2) =54a(3) =1659a(4) =29479a(5) =1541443a(6) =71307109a(7) =5846922441a(8) =668263785713
External references
- oeis: A303889