Number of (n+1) X (3+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.

A250848

Number of (n+1) X (3+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) =1225a(1) =8037a(2) =44797a(3) =223933a(4) =1043885a(5) =4648157a(6) =20067117a(7) =84805533a(8) =353060845a(9) =1454214877a(10) =5943685037a(11) =24157039133a(12) =97778698605a(13) =394573711197

External references