632160

Appears in sequences

• The Wiener index of the cyclic phenylene with n hexagons (n>=3).at n=37A224456
• G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..3*n} binomial(3*n,k)^2 * x^k] / A(x)^n * x^n/n ).at n=13A255839