T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors.

A238287

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors.

Terms

    a(0) =4a(1) =16a(2) =16a(3) =50a(4) =204a(5) =50a(6) =144a(7) =1844a(8) =1844a(9) =144a(10) =422a(11) =13948a(12) =42084a(13) =13948a(14) =422a(15) =1268a(16) =105862a(17) =737366a(18) =737366a(19) =105862a(20) =1268a(21) =3823a(22) =850420a(23) =12926271a(24) =27913368a(25) =12926271a(26) =850420a(27) =3823a(28) =11472a(29) =6953993

External references