56931

Appears in sequences

• Expansion of 1/((1-4x)(1-6x)(1-7x)(1-8x)).at n=4A028130
• Number of unlabeled 3-trees on n vertices.at n=12A078792
• Integers that reach the (47360, 29127) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).at n=19A249614
• Triangle read by rows: T(n, k) = number of k-element subobjects of an n-element set in the category of relations, n >= 0, 0 <= k <= n.at n=31A373398
• a(n) = (2*n^3 - 6*n^2 + 19*n - 9)*n/6.at n=20A378023