243540

Appears in sequences

• Numbers taking exactly 21 steps to reach 15 in A086793.at n=18A119397
• Number of 7 X (n+1) 0..1 arrays with every 2 X 2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..1 introduced in row major order.at n=16A208088