a(n) = Sum_{k=0..n} binomial(4*n+k-1,k) * binomial(n-1,n-k).
A378613
a(n) = Sum_{k=0..n} binomial(4*n+k-1,k) * binomial(n-1,n-k).
Terms
- a(0) =1a(1) =4a(2) =44a(3) =532a(4) =6748a(5) =88024a(6) =1169444a(7) =15738328a(8) =213842716a(9) =2927097712a(10) =40302226944a(11) =557565134196
External references
- oeis: A378613