209475

Appears in sequences

• a(n) = binomial(n+4,4)*(2*n+1).at n=17A051880
• Number of walks of length n between two nodes at distance 4 in the cycle graph C_9.at n=17A095369
• The Wiener index of the ortho-polyphenyl chain with n hexagons (see the Dou et al. and the Deng references).at n=24A216108
• Expansion of 1/((1 - x)^9 - x^9).at n=13A306939
• Triangle read by rows where T(n,k) is the number of labeled loop-graphs with n vertices and n edges, k of which are loops.at n=31A368928