a(n) = Sum_{k=0..n-1} binomial(2*n, k)^2.
A387635
a(n) = Sum_{k=0..n-1} binomial(2*n, k)^2.
Terms
- a(0) =0a(1) =1a(2) =17a(3) =262a(4) =3985a(5) =60626a(6) =925190a(7) =14168988a(8) =217721745a(9) =3355615450a(10) =51855874642a(11) =803232328548
External references
- oeis: A387635