T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222722
T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/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) =1a(1) =0a(2) =0a(3) =0a(4) =6a(5) =0a(6) =6a(7) =30a(8) =30a(9) =6a(10) =20a(11) =666a(12) =1683a(13) =666a(14) =20a(15) =20a(16) =6524a(17) =88552a(18) =88552a(19) =6524a(20) =20a(21) =70a(22) =103378a(23) =2807505a(24) =12956013a(25) =2807505a(26) =103378a(27) =70a(28) =685a(29) =1250904
External references
- oeis: A222722