Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.

A253451

Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.

Terms

    a(0) =1388a(1) =4782a(2) =7782a(3) =11147a(4) =19254a(5) =39463a(6) =89556a(7) =218326a(8) =561564a(9) =1505134a(10) =4163556a(11) =11794246a(12) =33997164a(13) =99227614a(14) =292162356a(15) =865453366a(16) =2574299964a(17) =7678786894a(18) =22948141956a(19) =68667995686a(20) =205651133964a(21) =616247702974

External references