a(n) = Sum_{k=0..n} binomial(2*n,2*k)^2.
A098772
a(n) = Sum_{k=0..n} binomial(2*n,2*k)^2.
Terms
- a(0) =1a(1) =2a(2) =38a(3) =452a(4) =6470a(5) =92252a(6) =1352540a(7) =20056584a(8) =300546630a(9) =4537543340a(10) =68923356788
External references
- oeis: A098772