T(n,k)=Number of nXk nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.

A253011

T(n,k)=Number of nXk nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =0a(8) =0a(9) =1a(10) =4a(11) =1a(12) =0a(13) =1a(14) =4a(15) =10a(16) =19a(17) =1a(18) =1a(19) =19a(20) =10a(21) =20a(22) =85a(23) =54a(24) =1a(25) =54a(26) =85a(27) =20a(28) =35a(29) =231

External references