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 x(i,j)-x(i-1,j) in the j direction.

A250539

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 x(i,j)-x(i-1,j) in the j direction.

Terms

    a(0) =6627a(1) =79366a(2) =644779a(3) =4169584a(4) =23289547a(5) =117777788a(6) =555362165a(7) =2489782728a(8) =10756619019a(9) =45218540866a(10) =186284270079a(11) =756106728264

External references