305140

Appears in sequences

• a(n) = n*(27*n^3 + 22*n^2 - 21*n - 16)/12.at n=19A172085
• Triangle read by rows: T(n,k) = number of chiral pairs of color patterns (set partitions) in a row of length n using exactly k colors (subsets).at n=69A320525
• Number of chiral pairs of color patterns (set partitions) in a row of length n using exactly 4 colors (subsets).at n=11A320527