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

A237683

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

Terms

    a(0) =81a(1) =474a(2) =474a(3) =2741a(4) =4146a(5) =2741a(6) =15948a(7) =35620a(8) =35620a(9) =15948a(10) =93093a(11) =308814a(12) =449258a(13) =308814a(14) =93093a(15) =541880a(16) =2688928a(17) =5732688a(18) =5732688a(19) =2688928a(20) =541880a(21) =3152844a(22) =23395998a(23) =74265677a(24) =109962932a(25) =74265677a(26) =23395998a(27) =3152844a(28) =18356756

External references