a(n) = n! * Sum_{i=1..n} (1/i)*Sum_{j=0..i-1} 1/j!.
A093344
a(n) = n! * Sum_{i=1..n} (1/i)*Sum_{j=0..i-1} 1/j!.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =17a(4) =84a(5) =485a(6) =3236a(7) =24609a(8) =210572a(9) =2004749a(10) =21033900a(11) =241237001a(12) =3003349124a(13) =40345599957a(14) =581765196884
External references
- oeis: A093344