Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A223042
Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =2a(1) =8a(2) =98a(3) =1265a(4) =17356a(5) =241583a(6) =3395532a(7) =48048796a(8) =683306658a(9) =9759462283a(10) =139866408792
External references
- oeis: A223042