14192640

Appears in sequences

• Theta series of P_{12a} packing.at n=17A005952
• Triangle of coefficients of x^2 in the Neumann polynomials.at n=38A057869
• a(1) = 1; for n >= 2, suppose a(n-1) = Product p_i^e_i and n = Product p_i^f_i, then a(n) = Product p_i^(e_i*f_i).at n=11A072181
• a(1) = 1; a(n)= 2*lcm(n, a(n - 1)).at n=11A191778
• Number of centrally symmetric diagonal Latin squares of order n.at n=6A293778
• a(0) = 1, a(n) = harmonic_mean(a(n-1), n), where harmonic_mean(p, q) = 2/(1/p + 1/q); numerators.at n=12A353250