93030

Appears in sequences

• Irregular array, read by rows: T(n,k) is the number of labeled acyclic digraphs with n nodes and k arcs (n >= 0, 0 <= k <= n*(n-1)/2).at n=46A081064
• Number of 3 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.at n=34A086113
• Number of consistent sets of 4 irreflexive binary order relationships over n objects.at n=3A147817
• The sequence of coefficients of a polynomial recursion: p(x,n)=If[Mod[n, 2] == 0, (x + 1)*p(x, n - 1), (x^2 + (2*n - 1)*x + 1)^Floor[n/2]] ( correction).at n=58A171146
• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 n X 2 array.at n=40A219211