T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
A198209
T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =4a(1) =43a(2) =43a(3) =658a(4) =1765a(5) =658a(6) =11029a(7) =50729a(8) =50729a(9) =11029a(10) =189376a(11) =1660672a(12) =3603458a(13) =1660672a(14) =189376a(15) =3272959a(16) =56315642a(17) =276030525a(18) =276030525a(19) =56315642a(20) =3272959a(21) =56665678a(22) =1930887802a(23) =21989253467a(24) =51432469614a(25) =21989253467a(26) =1930887802
External references
- oeis: A198209