25324
domain: N
Appears in sequences
- a(n) = n*(11*n^2 - 5)/6.at n=24A004467
- Numbers k such that 3*R_k - 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=28A055557
- G.f. satisfies: A(x) = Sum_{n>=0} x^n / (A(x) - n*x)^n.at n=9A224786
- Cogrowth function of the group Baumslag-Solitar(2,2).at n=5A229644
- Row sums of triangle in A139040.at n=45A238383
- a(n) = A306302(n)/2.at n=23A331756
- Number of vertices in graph G_n formed by taking a regular n-gon with all its chords extended to infinity (the n-th graph in A344857) and inverting it in its circumscribing circle.at n=20A383461