129140160

Appears in sequences

• Number of ternary sequences with primitive period n.at n=17A054718
• The sequence lambda(3,n), where lambda is defined in A055203. Number of ways of placing n identifiable positive intervals with a total of exactly three starting and/or finishing points.at n=17A058809
• Expansion of -2*x*(-8-12*x+9*x^2) / ( (x-1)*(3*x-1)*(3*x+1)*(1+x) ).at n=16A120468
• a(n) = A000244(n) - A010684(n).at n=17A141317
• Number of ways to seat 4 types of people in n labeled seats around a circle such that no two adjacent people are of the same type.at n=17A218034
• Closed walks of length n in K_4 graph.at n=16A226493
• Largest number k that is not the sum of 3 squares and a nonnegative (2n+5)-th power.at n=5A299796
• a(n) = phi(n^n + n) where phi is the Euler totient function.at n=8A377674