31252

Appears in sequences

• Numbers n such that there is no square n-gonal number greater than 1.at n=30A188896
• 1/n! times the number of ordered pairs of permutation functions f,g on n elements where f(f(x)) = g(f(g(x))).at n=20A255515
• Expansion of (4 + 15*x - 35*x^2 + 20*x^3 - 2*x^5)/(1 - x)^5.at n=20A257600
• a(n) = (n^4 + 20*n^3 + 125*n^2 + 250*n + 24)/12.at n=20A257601
• G.f. = Phi^5*F, where Phi = g.f. for A028930, F = g.f. for A028959.at n=15A328532
• Triangle read by rows: T(n,k) is the number of embeddings on the sphere of 2-connected planar graphs with n nodes and k faces up to orientation preserving isomorphisms, n >= 3, k=2..2*n-4.at n=41A342059