27634932

Appears in sequences

• A traffic light problem: expansion of 2/(1 - 3*x)^3.at n=11A006043
• Sum of the lengths of the drops in all ternary words of length n on {0,1,2}. The drops of a ternary word on {0,1,2} are the subwords 10,20 and 21, their lengths being the differences 1, 2 and 1, respectively.at n=13A120908
• (n-1)-st elementary symmetric function of the first n terms of A010684.at n=25A203230
• (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (3,1,3,1,3,1,3,1,...).at n=25A203231
• Number of n X 2 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.at n=6A269270
• Number of 7Xn 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.at n=1A269282