154825

Appears in sequences

• T(n,k) is the number of n X k 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal, diagonal and antidiagonal neighbors by a power of two.at n=22A265635
• Number of 2 X n 0..2*n-1 arrays with upper left zero and lower right 2*n-1 and each element differing from its horizontal, diagonal and antidiagonal neighbors by a power of two.at n=5A265636
• a(n) = Sum_{k=1..n} binomial(2*n, n-k) * sigma_2(k).at n=7A356339