904330

Appears in sequences

• Number of length n+2 0..8 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..8 introduced in 0..8 order.at n=15A243727
• Unitary abundant numbers k such that k+2 is also unitary abundant.at n=30A292704
• Triangle read by rows: T(n,k) is the number of nonisomorphic semigroups with n elements whose center contains k elements.at n=31A391159