134560

Appears in sequences

• a(n) = 2*(n-1)*(n^2 + 1).at n=40A071233
• a(n) = (A278399(n)^2 + A278400(n)^2)/2.at n=46A278420
• Expansion of the series e(q)*e(-q) (even coefficients only), where the series e(q) is Morier-Genoud and Ovsienko's q-analog of the real number e = exp(1).at n=17A392022
• Number of edges in a complete bipartite graph where the n vertices of each part are placed on the vertices, and on opposite sides, of a regular 2n-gon.at n=23A392973