a(n) = n! * Sum_{k=1..n} 1/(k * floor(n/k)!).
A356015
a(n) = n! * Sum_{k=1..n} 1/(k * floor(n/k)!).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =125a(5) =625a(6) =5089a(7) =38185a(8) =343657a(9) =3376081a(10) =40765681a(11) =427649761a(12) =6038448481a(13) =84486386881
External references
- oeis: A356015