10813440

Appears in sequences

• 4-fold convolution of A000302 (powers of 4); expansion of g.f. 1/(1-4*x)^4.at n=8A038846
• Triangle giving a(n,k) = number of k-colored labeled graphs with n nodes.at n=18A046860
• Expansion of ((1+x)/(1-2x))^2.at n=18A113070
• Number of labeled graphs on n vertices that can be colored using exactly 4 colors.at n=5A224068
• a(n) = (1+(-1)^n)/2*4^n*(C((3*n)/2-1,n))+(1-(-1)^n)/2*((C((3*n-1)/2,n))*(C(3*n-1,(3*n-1)/2)))/(C(n-1,(n-1)/2)).at n=8A348618