154980

Appears in sequences

• Triangle read by rows: T(n,k) is the number of hex trees with n edges and k pairs of adjacent vertices of outdegree 2.at n=35A126188
• a(n) = 7*A000330(n).at n=40A169607
• Number of n X 7 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=9A208378
• First differences of (provable) Sierpiński numbers (A076336).at n=4A270971
• a(n) = 6*(n - 1)*(81*n - 104) for n >= 1.at n=18A304837