127412

Appears in sequences

• Number of n X 3 binary arrays with every element neighboring horizontally or vertically both a 0 and a 1.at n=8A203280
• T(n,k)=Number of nXk binary arrays with every element neighboring horizontally or vertically both a 0 and a 1.at n=57A203285
• Number of vertices in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and n+2 equally spaced points along the diameter (a total of 2n+2 points). See Comments for precise definition.at n=23A334458