a(n) = (2*n-1)!! * Sum_{k=0..n} k/(2*k-1)!!.
A368792
a(n) = (2*n-1)!! * Sum_{k=0..n} k/(2*k-1)!!.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =28a(4) =200a(5) =1805a(6) =19861a(7) =258200a(8) =3873008a(9) =65841145a(10) =1250981765a(11) =26270617076a(12) =604224192760
External references
- oeis: A368792