21280

Appears in sequences

• Number of 3 X n Latin rectangles in which the first row is in order.at n=6A000186
• Theta series of lattice Kappa_11.at n=5A015229
• Expansion of g.f. 1/((1 - 4*x)*(1 - 6*x)).at n=5A016149
• Erroneous version of A000186.at n=6A046744
• Numbers k such that sigma (x) = k has exactly 11 solutions.at n=26A060678
• a(n) = n*(n+2)*(n-2)/3.at n=38A077415
• Number of unlabeled, connected graphs on n vertices which have no induced subgraph isomorphic to a P5, P5-bar or C5 and are not bipartite nor cobipartite and are primes.at n=10A079567
• 5th binomial transform of (0,1,0,1,...), A000035.at n=6A081199
• Number of ways to change three non-identical letters in the word aabbccdd..., where there are n types of letters.at n=19A102860
• Square array by antidiagonals of number of straight lines with n points in a k-dimensional hypercube with n points on each edge.at n=39A105373
• Natural numbers that can be factored into the product of three positive integers whose minimal sum is achieved in more than one way.at n=24A112536
• Numbers k such that the number of prime divisors of the k-th Catalan number (counted with multiplicity) divides k.at n=32A121612
• Weight distribution of [40,20,8] double circulant code.at n=3A146893
• Weight distribution of [40,20,8] double circulant code.at n=7A146893
• 5 times octagonal numbers: a(n) = 5*n*(3*n-2).at n=38A153795
• a(n) = 686*n + 14.at n=30A157366
• Number of reduced words of length n in the Weyl group D_7.at n=21A162210
• Number of ways to place 2 nonattacking kings on an n X n X n raumschach board.at n=6A166540
• Array T(n,k) read by antidiagonals: T(n,k) = Sum_{v=1..n, v odd} binomial(n,v)*k^v.at n=49A169629
• Sequence obtained by a formal reading of Riordan's Eq. (30a), p. 206.at n=6A170904