335664
domain: N
Appears in sequences
- Theta series of E_8 lattice with respect to midpoint of edge.at n=27A045819
- Numbers k such that sigma(k+1) = 5*phi(k).at n=25A067263
- a(0)=1, a(n) = sigma_3(2n).at n=33A091986
- a(0)=1, a(n) = sigma_3(3n).at n=22A092341
- Number of vertices in a regular 2n-gon when all vertices are connect by straight lines except for the n lines joining diametrically opposite vertices.at n=27A368814