118044

Appears in sequences

• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k double descents and initial descents (n>=0; 0<=k<=max(0,n-1)) [we say that i is a doubledescent of a permutation p if p(i) > p(i+1) > p(i+2); we say that a permutation p has an initial descent if p(1) > p(2)].at n=38A162976
• Number of triangles on a centered hexagonal grid of size n.at n=5A241223
• Number of unordered pairs of 4-colorings of an n-cycle that differ in the coloring of exactly one vertex.at n=6A326347