a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * binomial(n+1,k).
A388060
a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * binomial(n+1,k).
Terms
- a(0) =1a(1) =9a(2) =73a(3) =593a(4) =4881a(5) =40665a(6) =342105a(7) =2900385a(8) =24742945a(9) =212155049a(10) =1826784873a(11) =15785733617a(12) =136822905649
External references
- oeis: A388060