T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median minus the lower median of every 2X2 subblock equal.

A237538

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median minus the lower median of every 2X2 subblock equal.

Terms

    a(0) =256a(1) =1692a(2) =1692a(3) =11602a(4) =23680a(5) =11602a(6) =83104a(7) =330210a(8) =330210a(9) =83104a(10) =598364a(11) =4857060a(12) =9080246a(13) =4857060a(14) =598364a(15) =4364082a(16) =70923320a(17) =266120870a(18) =266120870a(19) =70923320a(20) =4364082a(21) =31944336a(22) =1050283590a(23) =7718716424a(24) =15808900408a(25) =7718716424

External references