a(n) = Sum_{k=0..n} binomial(4*n+2*k+1,n-k).
A390414
a(n) = Sum_{k=0..n} binomial(4*n+2*k+1,n-k).
Terms
- a(0) =1a(1) =6a(2) =48a(3) =409a(4) =3583a(5) =31885a(6) =286640a(7) =2595310a(8) =23623866a(9) =215925639a(10) =1980119689a(11) =18207694341a(12) =167804095979
External references
- oeis: A390414