a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(4*n,k).
A387932
a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(4*n,k).
Terms
- a(0) =1a(1) =13a(2) =301a(3) =7831a(4) =214573a(5) =6054898a(6) =174132559a(7) =5074737016a(8) =149348617069
External references
- oeis: A387932