220448

Appears in sequences

• Half the number of nX4 binary arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors.at n=7A183400
• Numbers k such that sigma(k) + tau(k) + phi(k) is a prime, where sigma(k) = A000203(k), tau(k) = A000005(k) and phi(k) = A000010(k).at n=23A229265
• a(n) = Sum_{k>=0} (1/2)^(k+1) * |Stirling1(n+k,k)|.at n=5A390898