a(n) = n!^2 * Sum_{m=1..n}( Sum_{k=1..m} 1/(k*m) ).
A060237
a(n) = n!^2 * Sum_{m=1..n}( Sum_{k=1..m} 1/(k*m) ).
Terms
- a(0) =1a(1) =7a(2) =85a(3) =1660a(4) =48076a(5) =1942416a(6) =104587344a(7) =7245893376a(8) =628308907776
External references
- oeis: A060237