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

A236789

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

Terms

    a(0) =81a(1) =255a(2) =255a(3) =770a(4) =1097a(5) =770a(6) =2475a(7) =4452a(8) =4452a(9) =2475a(10) =7967a(11) =19851a(12) =23675a(13) =19851a(14) =7967a(15) =26320a(16) =87889a(17) =145124a(18) =145124a(19) =87889a(20) =26320a(21) =87685a(22) =405350a(23) =867928a(24) =1287919a(25) =867928a(26) =405350a(27) =87685a(28) =296341a(29) =1877803

External references