a(n) = Sum_{k=0..n} binomial(n,k) * binomial(2*n+4*k,k).
A388727
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(2*n+4*k,k).
Terms
- a(0) =1a(1) =7a(2) =83a(3) =1120a(4) =15955a(5) =234257a(6) =3506600a(7) =53201624a(8) =815208275a(9) =12586819621a(10) =195514618393
External references
- oeis: A388727