Number of nX4 arrays of permutations of 4 copies of 0..n-1 with rows and columns nondecreasing.
A265001
Number of nX4 arrays of permutations of 4 copies of 0..n-1 with rows and columns nondecreasing.
Terms
- a(0) =1a(1) =3a(2) =14a(3) =112a(4) =1095a(5) =13009a(6) =175865a(7) =2647438a(8) =43347498a(9) =760869739a(10) =14150265025a(11) =276374334318
External references
- oeis: A265001