T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences.

A210156

T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences.

Terms

    a(0) =57a(1) =820a(2) =820a(3) =11783a(4) =42689a(5) =11783a(6) =169343a(7) =2219034a(8) =2219034a(9) =169343a(10) =2433709a(11) =115368738a(12) =417014920a(13) =115368738a(14) =2433709a(15) =34976109a(16) =5997955680a(17) =78387305947a(18) =78387305947a(19) =5997955680a(20) =34976109a(21) =502659771a(22) =311831135649

External references