a(n) = Sum_{k=0..floor(n/2)} binomial(n,k)^2 * binomial(n-k,k) * 2^k.
A381482
a(n) = Sum_{k=0..floor(n/2)} binomial(n,k)^2 * binomial(n-k,k) * 2^k.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =37a(4) =241a(5) =1401a(6) =8961a(7) =57429a(8) =377217a(9) =2509201a(10) =16876729a(11) =114600069a(12) =783903121a(13) =5397915433a(14) =37372017489a(15) =259998843477
External references
- oeis: A381482