236281

Appears in sequences

• Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 5 sites wide.at n=43A058368
• a(n) = floor(r^n) where r is the smallest Pisot number (real root r=1.3247179... of x^3-x-1).at n=44A112639
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 873", based on the 5-celled von Neumann neighborhood.at n=8A273708