20755

Appears in sequences

• Number of 5 X n binary matrices with no zero rows or columns, up to row and column permutation.at n=5A055083
• Number of 6 X n binary matrices with no zero rows or columns, up to row and column permutation.at n=4A055084
• Triangular array giving number of bipartite graphs with n vertices, no isolated vertices and a distinguished bipartite block with k=1..n-1 vertices, up to isomorphism.at n=49A056152
• Triangular array giving number of bipartite graphs with n vertices, no isolated vertices and a distinguished bipartite block with k=1..n-1 vertices, up to isomorphism.at n=50A056152
• Least number which is the sum of four nonnegative cubes (not necessarily distinct and including zero) in n ways.at n=7A076749
• Triangle read by rows in which row n gives the number of unlabeled bicolored graphs having k nodes of one color and n-k nodes of the other color, with no isolated nodes; the color classes are not interchangeable.at n=71A122083
• Triangle read by rows in which row n gives the number of unlabeled bicolored graphs having k nodes of one color and n-k nodes of the other color, with no isolated nodes; the color classes are not interchangeable.at n=72A122083
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 622", based on the 5-celled von Neumann neighborhood.at n=38A269567
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p that are > p/2.at n=18A282722
• a(n) = n * (binomial(n,2) - 2).at n=35A341768
• Numbers that are the sum of four third powers in six or more ways.at n=27A345148
• Numbers that are the sum of four third powers in seven or more ways.at n=3A345150
• Numbers that are the sum of four third powers in exactly seven ways.at n=3A345151
• G.f. A(x) satisfies: A(x) = 1 + x + x^2 * A(x/(1 - 6*x)) / (1 - 6*x).at n=7A351057