216864

Appears in sequences

• Triangle read by rows: T(n,k) = the number of Dyck paths of semilength n with k UDDU's.at n=45A135306
• Number of length-n 0..3 arrays with every repeated value unequal to the previous repeated value plus one mod 3+1.at n=8A269771
• Sum of the asymmetry degrees of all compositions of n with parts in {3,4,5,6, ...}.at n=34A276059
• a(n) is the number of regular hexagons with all six vertices (x,y,z) in the set {1,2,...,n}^3.at n=20A338322