a(n) = (n!/2)*Sum_{k=1..n} (n+k)!/(k!)^3.
A073014
a(n) = (n!/2)*Sum_{k=1..n} (n+k)!/(k!)^3.
Terms
- a(0) =1a(1) =9a(2) =127a(3) =2835a(4) =93901a(5) =4336878a(6) =266268402a(7) =20961918435
External references
- oeis: A073014
A073014
a(n) = (n!/2)*Sum_{k=1..n} (n+k)!/(k!)^3.