133244

Appears in sequences

• Number of subsets of the first n numbers having a common divisor greater than 1.at n=34A109511
• Number of 5-length words w over n-ary alphabet such that for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.at n=12A213284
• The number of trees with 5 nodes labeled by positive integers, where each tree's label sum is n.at n=39A301740
• G.f. A(x) satisfies A(x)^2 = A(2*x - 2*A(x)) / 2.at n=10A389540