a(n) = T(n, 2*n), where T(n, x) is the Chebyshev polynomial of the first kind.

A349071

a(n) = T(n, 2*n), where T(n, x) is the Chebyshev polynomial of the first kind.

Terms

    a(0) =1a(1) =2a(2) =31a(3) =846a(4) =32257a(5) =1580050a(6) =94558751a(7) =6686381534a(8) =545471324161

External references