a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(2*n,k).
A387928
a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(2*n,k).
Terms
- a(0) =1a(1) =7a(2) =79a(3) =1000a(4) =13327a(5) =182887a(6) =2557684a(7) =36245608a(8) =518690095a(9) =7478672005a(10) =108474941239
External references
- oeis: A387928