a(n) = n! * Sum_{k=0..floor(n/2)} 1/binomial(n-k, k).
A358446
a(n) = n! * Sum_{k=0..floor(n/2)} 1/binomial(n-k, k).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =56a(5) =190a(6) =1704a(7) =7644a(8) =93120a(9) =516240a(10) =8136000a(11) =53523360a(12) =1047548160a(13) =7961241600a(14) =187132377600
External references
- oeis: A358446