a(n) = A361540(n, n-2) for n >= 2, a diagonal of triangle A361540.

A361539

a(n) = A361540(n, n-2) for n >= 2, a diagonal of triangle A361540.

Terms

    a(0) =3a(1) =39a(2) =426a(3) =4550a(4) =50085a(5) =577731a(6) =7022596a(7) =90148860a(8) =1222753815a(9) =17515226465a(10) =264663151038

External references