Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222718
Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =6a(2) =30a(3) =666a(4) =6524a(5) =103378a(6) =1250904a(7) =17976376a(8) =235892592a(9) =3296371800a(10) =44713314784a(11) =621198984864
External references
- oeis: A222718