a(n) = Sum_{k=0..n} (-1)^(n-k)*binomial(n,k)*binomial(2*k,k)^2.

A278934

a(n) = Sum_{k=0..n} (-1)^(n-k)*binomial(n,k)*binomial(2*k,k)^2.

Terms

    a(0) =1a(1) =3a(2) =29a(3) =303a(4) =3501a(5) =42663a(6) =538769a(7) =6977547a(8) =92078989a(9) =1232902023a(10) =16700233689a(11) =228356672547

External references