Number of (2+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
A250693
Number of (2+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =520a(1) =2920a(2) =13906a(3) =60508a(4) =249512a(5) =995624a(6) =3894542a(7) =15061244a(8) =57914756a(9) =222291368a(10) =853854042a(11) =3287692860a(12) =12701872800a(13) =49262782920a(14) =191821043814a(15) =749801489244
External references
- oeis: A250693