3177405

Appears in sequences

• Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero and first differences in -4..4.at n=10A209028
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 155", based on the 5-celled von Neumann neighborhood.at n=10A270326