23881

Appears in sequences

• Total number of branches of length k (k>=1) in all ordered trees with n+k edges (it is independent of k).at n=8A073663
• Numbers n such that primorial(n)/2 + 256 is prime.at n=22A139451
• Number of standard Young tableaux of n cells and height >= 8.at n=5A218268
• Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.at n=9A220705
• Numbers for which the harmonic mean of nontrivial divisors is an integer and which are not a square of prime numbers.at n=7A247079
• a(n) = 1 + Sum_{k=1..n} binomial(n,k) * 3^k * k^k.at n=4A277456
• Numbers n such that there is precisely 1 group of order n, 2 of order n + 1 and 3 of order n + 2.at n=16A296024
• The largest nontrivial divisor of n equals the sum of the other nontrivial divisors of n.at n=4A333079
• Numbers for which the harmonic mean of the nontrivial unitary divisors is an integer.at n=10A335269
• a(n) = 2*a(n-1) + 3*a(n-2) + 5*a(n-3), a(0) = 0, a(1) = 1, a(2) = 1.at n=10A335720
• Number of achiral colorings of the 6 square faces of a cube or the 6 vertices of a regular octahedron using n or fewer colors.at n=10A337898
• Expansion of g.f. A(x) satisfying A(x)^2 = A( x^2/(1-2*x)^5 )/(1-2*x).at n=8A375445