a(n) = Sum_{k=0..n} 5^(n-k) * binomial(n,k) * binomial(n+1,k).
A386398
a(n) = Sum_{k=0..n} 5^(n-k) * binomial(n,k) * binomial(n+1,k).
Terms
- a(0) =1a(1) =7a(2) =58a(3) =519a(4) =4830a(5) =46006a(6) =445012a(7) =4352263a(8) =42920374a(9) =426019410a(10) =4250694636a(11) =42594281142a(12) =428350623468
External references
- oeis: A386398