2058462

Appears in sequences

• Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,4,1,0,1 for x=0,1,2,3,4.at n=12A197368
• a(n) is the number of sparse rulers of length n where the length of the first segment is unique.at n=25A331330