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

A237567

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

Terms

    a(0) =81a(1) =316a(2) =316a(3) =1256a(4) =1536a(5) =1256a(6) =4984a(7) =7356a(8) =7356a(9) =4984a(10) =19900a(11) =36168a(12) =44828a(13) =36168a(14) =19900a(15) =78144a(16) =175768a(17) =272828a(18) =272828a(19) =175768a(20) =78144a(21) =311512a(22) =848720a(23) =1668300a(24) =2161168a(25) =1668300a(26) =848720a(27) =311512a(28) =1227648a(29) =4121060

External references