T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.

A250877

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.

Terms

    a(0) =90a(1) =288a(2) =440a(3) =678a(4) =1456a(5) =2002a(6) =1328a(7) =3442a(8) =6812a(9) =8736a(10) =2306a(11) =6728a(12) =16262a(13) =30360a(14) =37130a(15) =3680a(16) =11644a(17) =31928a(18) =73122a(19) =131068a(20) =155080a(21) =5518a(22) =18520a(23) =55386a(24) =144248a(25) =317878a(26) =553736a(27) =640002a(28) =7888a(29) =27686

External references