Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 6 times.
A248840
Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 6 times.
Terms
- a(0) =2a(1) =6a(2) =24a(3) =120a(4) =720a(5) =5040a(6) =40318a(7) =362804a(8) =3626872a(9) =39874764a(10) =478139586a(11) =6209677488a(12) =86828161058
External references
- oeis: A248840