1548288

Appears in sequences

• Theta series of extremal odd unimodular lattice D_8^{+2} with minimal norm 2 in dimension 16.at n=7A032802
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*3^j.at n=39A038233
• 17-almost primes (generalization of semiprimes).at n=24A069278
• Triangular array T(n,k) read by rows, giving number of labeled free trees such that the root is smaller than all its children, with respect to the number n of vertices and to the degree k of the root.at n=30A071210
• Product of elements in the simple continued fraction for (1+1/n)^n.at n=8A071599
• Product{<n/k>: k=1,2,...,n}, where <x> denotes the integer second nearest to x. (For x=(2h+1)/2, <x> is defined to be h, not h+1; if x is an integer, then <x> is defined to be x+1.)at n=14A075998
• Row sums of triangle A128182.at n=16A128183
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=11A192386
• For n > 2 , a(n) = a(n-2) + lcm(a(n-2), n-1) with a(1)=2, a(2)=2.at n=15A217662
• a(n) = Sum_{0 < x,y,z,t <= n and gcd(x^2 + y^2 + z^2 + t^2, n)=1} gcd(x^2 + y^2 + z^2 + t^2 - 1, n).at n=27A239613
• Coefficients in expansion of Eisenstein series -q*(d/dq)(q*(d/dq)E_2).at n=32A282154
• Expansion of Product_{k>=1} (1 + 2^(k-1)*x^k).at n=18A304961
• Number of subsets of {2...n} containing no element whose prime indices all belong to the subset.at n=24A324739
• Nonprimes k such that sopfr(k) = rad(k), where sopfr(k) is sum of the prime factors of k (counting multiplicity), and rad(k) is the product of its distinct prime factors.at n=22A386916