246410

Appears in sequences

• a(n) = 2*a(n-1) + 9*a(n-2), with a(0) = 0, a(1) = 1.at n=10A002534
• Number of 5-valent trees with n nodes.at n=19A036650
• Sides of integer Heronian triangles [prime(A068964(n)), prime(A068964(n)+1), a(n)] with area A068966(n).at n=18A068965
• a(n) = ((1 + sqrt(n))^n - (1 - sqrt(n))^n)/(2*sqrt(n)).at n=9A357502