26688

Appears in sequences

• Number of n-step polygons on Kagome lattice.at n=13A005397
• Expansion of Product_{k>=1} (1 + 3*x^k).at n=27A032308
• Number of configurations of linear chains in a cubic lattice.at n=6A047057
• Number of nonprimes <= prime(n)^2.at n=39A053683
• Column 2 of triangle A055907.at n=33A055908
• McKay-Thompson series of class 18E for Monster.at n=22A058535
• Sizes of successive increasing gaps between 3-smooth numbers.at n=42A084788
• McKay-Thompson series of class 18E for the Monster group with a(0) = 3.at n=22A128517
• Expansion of (phi(-q^3)^2 / (phi(-q) * phi(-q^9)))^2 in powers of q where phi() is a Ramanujan theta function.at n=21A227587
• a(n) = floor( prime(n)^3 / (n*log(n)) ).at n=34A259648
• Number of subsets of {2..n} containing all of their integer quotients > 1.at n=20A326078
• Number of compositions of n with no adjacent triples (..., x, y, z, ...) where x <= y <= z.at n=20A344615
• a(n) is the smallest integer m, such that for every sufficiently large integer k, A165370(729*k+n) can be written as m followed by zero or more 9's.at n=6A346789
• G.f. satisfies A(x) = ( 1 + x * A(x) * (1 + A(x)) )^2.at n=5A371693
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,0) = 0^n and T(n,k) = k * Sum_{r=0..n} binomial(n,r) * binomial(2*n+2*r+k,n)/(2*n+2*r+k) for k > 0.at n=33A378239
• Number of tetrahedra in the n X n white bishop graph.at n=18A391027