a(n) = (2*n+1)!! * (Sum_{k=1..n} 1/(2*k+1)).
A334670
a(n) = (2*n+1)!! * (Sum_{k=1..n} 1/(2*k+1)).
Terms
- a(0) =0a(1) =1a(2) =8a(3) =71a(4) =744a(5) =9129a(6) =129072a(7) =2071215a(8) =37237680a(9) =741975345a(10) =16236211320a(11) =387182170935
External references
- oeis: A334670