21043

Appears in sequences

• a(n) = floor(n(n+2)(2n+1)/8).at n=43A002717
• Positive numbers k such that k and 2*k are anagrams in base 6 (written in base 6).at n=22A023064
• Number of partitions of n into parts not of the form 23k, 23k+2 or 23k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 10 are greater than 1.at n=43A035990
• a(n) = (4*n^3 + 11*n^2 + 9*n + 2)/2.at n=21A135712
• Number of nX2 arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 nX2 array.at n=9A219933
• Number of partitions of n such that m(2) = m(3), where m = multiplicity.at n=46A240064
• The 60-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=42A244802
• Partial sums of A299900.at n=34A299901
• Number of compositions (ordered partitions) of n into distinct parts where no part is a multiple of 5.at n=32A332311
• Sum of the areas of all r X s rectangles such that r + s = 2n, with r, s composite.at n=35A334229
• Number of sets in the geometry determined by the Hausdorff metric at each location between two sets defined by a complete bipartite graph K(3,n) (with n at least 3) missing two edges, where the two removed edges are not incident to the same vertex in the 3-point set and are also not incident to the same vertex in the other set.at n=3A340199
• Number of sets in the geometry determined by the Hausdorff metric at each location between two sets defined by a complete bipartite graph K(6,n) (with n at least 3) missing two edges, where the two removed edges are not incident to the same vertex in the 6-point set and are also not incident to the same vertex in the other set.at n=0A340897