a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * Catalan(k).
A386387
a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * Catalan(k).
Terms
- a(0) =1a(1) =5a(2) =41a(3) =429a(4) =5073a(5) =64469a(6) =859385a(7) =11853949a(8) =167763361a(9) =2422342053a(10) =35543185353a(11) =528450589005
External references
- oeis: A386387