358668
domain: N
Appears in sequences
- Dirichlet convolution of powers of 3 (3,9,27,...) with themselves.at n=9A034719
- a(n) = 18n^3 + 6n^2.at n=27A087887
- Numbers k such that sigma(k)*phi(k)*k is a square.at n=16A114079
- Triangle read by rows: T(n,k) is number of hex trees with n edges and k nonroot nodes of outdegree 2.at n=27A126183
- E.g.f. satisfies A(x) = x * exp( 3*(x + A(x))/2 ).at n=6A360545