a(n) = Sum_{i=1..n} binomial(4*i,2*i).
A066797
a(n) = Sum_{i=1..n} binomial(4*i,2*i).
Terms
- a(0) =6a(1) =76a(2) =1000a(3) =13870a(4) =198626a(5) =2902782a(6) =43019382a(7) =644099772a(8) =9719235072a(9) =147565763892
External references
- oeis: A066797