89778

Appears in sequences

• The nearest integer of perimeter of T-square (fractal) after n-iterations, starting with a unit square.at n=23A227621
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=24A252525