57771

Appears in sequences

• a(n) = T(n^3) - T(n^2), where T() are the triangular numbers (A000217).at n=7A085743
• Irregular triangle read by rows: the number of hydrocarbon structures that can be drawn with a given number of carbons and units of unsaturation.at n=55A134819
• Snub dodecahedron with faces of centered polygons.at n=10A193249
• Expansion of x * (d/dx) Sum_{k>=0} k!*x^(k*(k+1)/2)/Product_{j=1..k} (1 - x^j).at n=21A304797