Number of 3 X 7 matrices with elements in 0..n with each row and each column in nondecreasing order. 3,7,n can be permuted, see formula.
A140907
Number of 3 X 7 matrices with elements in 0..n with each row and each column in nondecreasing order. 3,7,n can be permuted, see formula.
Terms
- a(0) =1a(1) =120a(2) =4950a(3) =108900a(4) =1557270a(5) =16195608a(6) =131589315a(7) =877262100a(8) =4971151900a(9) =24584605760a(10) =108284013552a(11) =431621592480
External references
- oeis: A140907