427819008

Appears in sequences

• Expansion of (1 + x - 2*x^2)/(1 - 2*x)^2.at n=24A052951
• Number of 6-cycles in the n-hypercube graph.at n=18A290031
• a(n) = n*(n-1)*(n- 2)^2*2^(n-4)/3.at n=17A391778