a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(4*k,k) / (3*k + 1).
A346664
a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(4*k,k) / (3*k + 1).
Terms
- a(0) =1a(1) =0a(2) =3a(3) =12a(4) =73a(5) =453a(6) =2985a(7) =20373a(8) =142933a(9) =1024302a(10) =7466211a(11) =55182240a(12) =412586977a(13) =3115105321a(14) =23717115513a(15) =181884676827
External references
- oeis: A346664