Number of 4 X n 0..2 arrays with row sums nondecreasing and column sums unimodal.
A223818
Number of 4 X n 0..2 arrays with row sums nondecreasing and column sums unimodal.
Terms
- a(0) =15a(1) =867a(2) =43941a(3) =1941904a(4) =76453838a(5) =2740448352a(6) =91020540767
External references
- oeis: A223818