132543

Appears in sequences

• Number of connected vertex-transitive graphs with n nodes.at n=33A006800
• Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=11A207112
• a(n) = 3/4*(3^(n + 1) - 2*n - 4*n^2 - 3).at n=10A367967