330624
domain: N
Appears in sequences
- Triangle of "Harmonic Coefficients" T(n,k), read by rows: (Sum_{i=1..n} T(n,i) * k^i) * k! / ((n+k)! * n!) = (Sum_{i=1..k} (1/i-1/(i+n)) = n * (Sum_{i=1..k} 1/(i*(i+n)))).at n=26A027858
- Number of labeled planted trees with 2-colored leaves.at n=6A038053
- Triangle giving a(n,k) = number of k-colored labeled graphs with n nodes.at n=22A046860
- a(n) = 9*(n-2)^2*(n^2-2*n-1)/2.at n=16A064199
- Numbers n such that core(n)=floor(sqrt(n)), where core(x)=A007913(x) is the squarefree part of x and floor(sqrt(x))=A000196(x).at n=31A069186
- a(n) = (n^2-1)^2-1.at n=24A178392
- Number of 2-colored graphs on n labeled nodes.at n=6A213441
- The Wiener index of the cyclic phenylene with n hexagons (n>=3).at n=29A224456
- Dimensions of totally primitive elements of Hopf algebra UBP*.at n=7A230890
- Number of 4-cycles in the n-halved cube graph.at n=8A290027
- Positive integers of the form k^2 - 1 that are the product of two other distinct positive integers of the form k^2 - 1.at n=31A372497