274320

Appears in sequences

• Number of collinear triples of distinct points in Zn x Zn with no two on the same "horizontal" or "vertical" line.at n=17A146557
• Number of (n+1)X5 0..2 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.at n=6A206211
• Number of (n+1)X8 0..2 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..2 introduced in row major order.at n=3A206214
• The Wiener index of the cyclic phenylene with n hexagons (n>=3).at n=27A224456
• Expansion of r(q^5) / r(q)^5 in powers of q where r() is the Rogers-Ramanujan continued fraction.at n=42A285585
• a(n) = Sum_{k=1..n} floor(k/2)! * floor((n - k)/2)! binomial((n-floor(k/2)-1), n-k).at n=14A339150
• Triangle read by rows: T(n,k) is the number of crystallized linear chord diagrams on n chords with k short chords.at n=37A375504