a(n) = (2*n+1)!! * Sum_{k=0..n} k/(2*k+1).
A334000
a(n) = (2*n+1)!! * Sum_{k=0..n} k/(2*k+1).
Terms
- a(0) =0a(1) =1a(2) =11a(3) =122a(4) =1518a(5) =21423a(6) =340869a(7) =6058980a(8) =119218860a(9) =2575293165a(10) =60628447215
External references
- oeis: A334000