520289

Appears in sequences

• 1/6 the number of (n+2)X7 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.at n=5A184473
• 1/6 the number of (n+2)X8 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.at n=4A184474