31056

Appears in sequences

• Number of 3 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.at n=23A086113
• a(n) = floor(10^n/7^n).at n=29A094992
• Related to numbers of equicolorable trees (see Pippenger article for definition).at n=11A119854
• G.f.: exp( Sum_{n>=1} (x^n/n) / Product_{d|n} (1 - d*x^d)^n ).at n=13A205490
• Number of ways 1/n can be expressed as the sum of four distinct unit fractions: 1/n = 1/w + 1/x + 1/y + 1/z satisfying 0 < w < x < y < z.at n=26A241883
• Numbers k such that Bernoulli number B_{k} has denominator 46410.at n=6A295590
• a(n) is the number of smallest parts in the overpartitions of n having odd smallest part.at n=20A335730
• Number of rooted planar maps with n edges and without faces of degree 1.at n=7A379433