8590000128

Appears in sequences

• a(n) = 2^(n-1)*(2^n - (-1)^n).at n=17A003674
• a(n) = 2^(n-1)*(1+2^n).at n=17A007582
• Number of undirected walks of length n+1 on an oriented triangle, visiting n+2 vertices, with n "corners"; the symmetry group is C3. Walks are not self-avoiding.at n=33A051437
• a(2n) = 2^(2n), a(2n+1) = 2^(2n+1) + a(n).at n=33A127804
• Number of n X 2 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabeled 8-colorings with no clashing color pairs).at n=9A233196
• Triangular numbers representable as 2^x + 2^y.at n=18A262242
• a(n) = (1/2) * Sum_{k=0..n-1} binomial(4*n,4*k+2).at n=9A387742