74689

Appears in sequences

• Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX3 array.at n=5A220957
• T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nXk array.at n=33A220959
• a(n) = numerator(-1/n + Sum_{k=1..n} 2^(k-1)/k).at n=9A332786