133416

Appears in sequences

• a(n) = (n-1)*(n+2)*(2*n+11)/2.at n=48A130862
• Denominators a(n) of Pythagorean approximations b(n)/a(n) to e.at n=7A195541
• a(n) is the number of configurations of n indistinguishable pairs placed on the vertices of the ladder graph P_2 X P_n such that all but 3 such pairs are joined by an edge.at n=10A318268