T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences.

A209960

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences.

Terms

    a(0) =71a(1) =567a(2) =567a(3) =4521a(4) =12161a(5) =4521a(6) =36057a(7) =260201a(8) =260201a(9) =36057a(10) =287559a(11) =5569307a(12) =14922177a(13) =5569307a(14) =287559a(15) =2293335a(16) =119198607a(17) =856216289a(18) =856216289a(19) =119198607a(20) =2293335a(21) =18289737a(22) =2551206049a(23) =49124545369a(24) =131724081683a(25) =49124545369

External references