Number of nX2 arrays containing 2 copies of 0..n-1 with row sums and column sums nondecreasing.
A267988
Number of nX2 arrays containing 2 copies of 0..n-1 with row sums and column sums nondecreasing.
Terms
- a(0) =1a(1) =4a(2) =21a(3) =189a(4) =1941a(5) =28032a(6) =448157a(7) =8951313a(8) =194183520a(9) =4923018003a(10) =134463192215
External references
- oeis: A267988