34816

Appears in sequences

• Generalized tangent numbers d_(n,2).at n=19A000176
• Expansion of e.g.f. (1 + tan(x))/(1 - tan(x)).at n=7A000831
• Number of 3-voter voting schemes with n linearly ranked choices.at n=30A007009
• E.g.f. tan(tan(x)^2) (even powers only).at n=4A009710
• Duplicate of A009710.at n=3A012389
• E.g.f. arctanh(tan(x)*tan(x)) (even powers only).at n=4A012393
• Place n distinguishable balls in n boxes (in n^n ways); let f(n,k) = number of ways that max in any box is k, for 1 <= k <= n; sequence gives f(n,n-2)/n.at n=14A019579
• a(n) = n*(n - 1)^3/2.at n=17A019582
• Sorted k-factorial numbers (numbers of form k-1 excluded).at n=39A028687
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 93.at n=39A031591
• Positions of the elements of the quasicyclic group Z+(2a+1)/(2^b) [a > 0 and a < 2^(b-1), b > 0] at the ]0,1[ side of the Stern-Brocot Tree (A007305/A007306).at n=37A065674
• 12-almost primes (generalization of semiprimes).at n=17A069273
• Solutions to phi(gpf(x)) - gpf(phi(x)) = 14 = c are special multiples of 17, x = 17k, where greatest prime factors of factor k were observed from {2, 3, 5}, i.e., it is smaller than 17. See solutions to other even cases of c (=A070813): A007283 for 0, A070004 for 2, A070815 for 254, A070816 for 65534. Gpf = greatest prime factor.at n=38A070814
• Integer reached in A075102.at n=10A075103
• Expansion of (1-x)/(1-2*x+2*x^2-2*x^3).at n=27A078003
• Numbers k such that phi(k) is a perfect 7th power.at n=14A078167
• a(n) = n*2^(n-6).at n=11A078836
• a(n) = -2*a(n-1) + 4*a(n-2), a(0) = 1, a(1) = 0.at n=10A086344
• Number of subsets of {1,.., n} containing at least one twin prime pair.at n=15A089828
• Expansion of x/(1 - 4*x^2 - 4*x^3).at n=14A099462