T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element.

A251283

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element.

Terms

    a(0) =230a(1) =3264a(2) =3264a(3) =46244a(4) =164800a(5) =46244a(6) =655040a(7) =8320896a(8) =8320896a(9) =655040a(10) =9278296a(11) =420152704a(12) =1497752279a(13) =420152704a(14) =9278296a(15) =131421696a(16) =21215177472a(17) =269564757184a(18) =269564757184a(19) =21215177472a(20) =131421696a(21) =1861511440

External references