Number of n X n 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).
A230657
Number of n X n 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =123a(4) =8613a(5) =337977a(6) =169006665a(7) =40860127671
External references
- oeis: A230657