Number of nXn 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317856
Number of nXn 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =3a(2) =4a(3) =56a(4) =350a(5) =3315a(6) =33238a(7) =517734a(8) =8875636a(9) =219127394a(10) =6925306920
External references
- oeis: A317856