235277

Appears in sequences

• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 165", based on the 5-celled von Neumann neighborhood.at n=8A270458
• a(1) = 1; a(n) = (2^n - 1)*((3^n - 1)/(2^n - 1) mod 1), n >= 2. Unreduced numerators of fractional parts of (3^n - 1)/(2^n - 1).at n=17A297446
• Number of automorphism group Gamma(n)-orbits of regular triangulations of the vertex set of the n-dimensional cube.at n=4A358385