a(n) = T(3*n, n), where T(n, x) is the Chebyshev polynomial of the first kind.

A349070

a(n) = T(3*n, n), where T(n, x) is the Chebyshev polynomial of the first kind.

Terms

    a(0) =1a(1) =1a(2) =1351a(3) =3880899a(4) =28355806081

External references