a(n) = (n-1)!*(Sum_{i=1..n} Sum_{j=1..i} binomial(i,j)*i/j).
A307663
a(n) = (n-1)!*(Sum_{i=1..n} Sum_{j=1..i} binomial(i,j)*i/j).
Terms
- a(0) =1a(1) =6a(2) =41a(3) =329a(4) =3090a(5) =33654a(6) =420792a(7) =5981688a(8) =95782320a(9) =1712555280a(10) =33909364800a(11) =737868052800
External references
- oeis: A307663