a(n) = Sum_{k=0..n} (2*k+1) * binomial(2*k,k) * binomial(2*n-k-1,n-k).
A386941
a(n) = Sum_{k=0..n} (2*k+1) * binomial(2*k,k) * binomial(2*n-k-1,n-k).
Terms
- a(0) =1a(1) =7a(2) =45a(3) =276a(4) =1645a(5) =9618a(6) =55468a(7) =316620a(8) =1792989a(9) =10089420a(10) =56482998a(11) =314859636a(12) =1748876220a(13) =9684449908a(14) =53487036420a(15) =294732771280
External references
- oeis: A386941