T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.

A237936

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.

Terms

    a(0) =256a(1) =1718a(2) =1718a(3) =11701a(4) =19694a(5) =11701a(6) =81402a(7) =228866a(8) =228866a(9) =81402a(10) =563166a(11) =2744048a(12) =4554824a(13) =2744048a(14) =563166a(15) =3880918a(16) =32465580a(17) =94068938a(18) =94068938a(19) =32465580a(20) =3880918a(21) =26804881a(22) =383375880a(23) =1903243716a(24) =3422869862a(25) =1903243716

External references