Number of 3 X 6 matrices with elements in 0..n with each row and each column in nondecreasing order. 3,6,n can be permuted, see formula.
A140903
Number of 3 X 6 matrices with elements in 0..n with each row and each column in nondecreasing order. 3,6,n can be permuted, see formula.
Terms
- a(0) =1a(1) =84a(2) =2520a(3) =41580a(4) =457380a(5) =3737448a(6) =24293412a(7) =131589315a(8) =614083470a(9) =2530768240a(10) =9386849472a(11) =31803696288a(12) =99604982880a(13) =291153026880a(14) =800670823920
External references
- oeis: A140903