a(n) = Sum_{k=0..n} binomial(n,k) * binomial(2*n+2*k,k).
A387105
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(2*n+2*k,k).
Terms
- a(0) =1a(1) =5a(2) =41a(3) =380a(4) =3713a(5) =37375a(6) =383480a(7) =3987485a(8) =41872625a(9) =443042525a(10) =4715882371a(11) =50442144505a(12) =541718997416
External references
- oeis: A387105