T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.

A235559

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.

Terms

    a(0) =256a(1) =2612a(2) =2612a(3) =23024a(4) =86742a(5) =23024a(6) =180640a(7) =2481481a(8) =2481481a(9) =180640a(10) =1321956a(11) =58495571a(12) =269127070a(13) =58495571a(14) =1321956a(15) =9182760a(16) =1190247008a(17) =24006644081a(18) =24006644081a(19) =1190247008a(20) =9182760a(21) =61590128a(22) =21374536916

External references