21072

Appears in sequences

• Number of (n+2) X 4 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..1 introduced in row major order.at n=16A204375
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 433", based on the 5-celled von Neumann neighborhood.at n=30A272147
• Numbers k such that Bernoulli number B_{k} has denominator 46410.at n=3A295590
• a(n) = Sum_{k=1..n} binomial(floor(n/k)+2,3).at n=45A364970