125217

Appears in sequences

• Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3.at n=6A037593
• Equals two maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 2Xn array.at n=9A220329