20945

Appears in sequences

• One-fourth of fourth column of Lucas bisection triangle (odd part).at n=4A061173
• (Prime(prime(n))^2-1)/24.at n=29A092772
• Number of (n+3)X(n+3) binary arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock.at n=8A188096
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 966", based on the 5-celled von Neumann neighborhood.at n=14A284538