a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(4*k,k).
A383119
a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(4*k,k).
Terms
- a(0) =1a(1) =3a(2) =21a(3) =147a(4) =1093a(5) =8343a(6) =64869a(7) =510891a(8) =4062277a(9) =32539647a(10) =262181601a(11) =2122581123a(12) =17252278789a(13) =140695104943
External references
- oeis: A383119