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

A250855

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

Terms

    a(0) =2670a(1) =13097a(2) =44797a(3) =123016a(4) =290646a(5) =614965a(6) =1195457a(7) =2172712a(8) =3738406a(9) =6146361a(10) =9724685a(11) =14888992a(12) =22156702a(13) =32162421a(14) =45674401a(15) =63612080a(16) =87064702a(17) =117311017a(18) =155840061a(19) =204373016a(20) =264886150a(21) =339634837a(22) =431178657a(23) =542407576a(24) =676569206

External references