T(n,k)=Half the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.

A209913

T(n,k)=Half the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.

Terms

    a(0) =62a(1) =562a(2) =562a(3) =5008a(4) =13098a(5) =5008a(6) =44770a(7) =295448a(8) =295448a(9) =44770a(10) =399930a(11) =6711168a(12) =16664508a(13) =6711168a(14) =399930a(15) =3573388a(16) =152153160a(17) =948609890a(18) =948609890a(19) =152153160a(20) =3573388a(21) =31926146a(22) =3452051294a(23) =53888573444a(24) =135833193008a(25) =53888573444

External references