233613

Appears in sequences

• Number of different energy states between two stacked necklaces, each of n positive and n negative charges.at n=8A045612
• Number of (n+2) X 9 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..1 introduced in row major order.at n=21A204380