a(n) = (n+1) * (n!)^2 * Sum_{k=1..n} 1/((k+1) * (k!)^2).
A368787
a(n) = (n+1) * (n!)^2 * Sum_{k=1..n} 1/((k+1) * (k!)^2).
Terms
- a(0) =0a(1) =1a(2) =7a(3) =85a(4) =1701a(5) =51031a(6) =2143303a(7) =120024969a(8) =8641797769a(9) =777761799211
External references
- oeis: A368787