569184

Appears in sequences

• Number of collinear triples of distinct points in Zn x Zn with no two on the same "horizontal" or "vertical" line.at n=20A146557
• Number of (n+1)X(n+1) 0..2 arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order.at n=2A231316
• Number of (n+1)X(3+1) 0..2 arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order.at n=2A231319
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order.at n=12A231324
• Numbers k such that squarefree part of sigma(k) is equal to squarefree part of 2*k.at n=34A331752