29144

Appears in sequences

• Number of n-bead necklaces with 4 colors.at n=9A001868
• An intermediate sequence for nonisomorphic circulant undirected p^2-graphs, indexed by odd primes p.at n=6A038783
• Number of ways to color vertices of a 9-gon using <= n colors, allowing only rotations.at n=4A054623
• Triangle read by rows: row n (n >= 1) contains the numbers T(n,k) = Sum_{d|n} phi(d)*k^(n/d)/n, for k=1..n.at n=39A054631
• Number of complementary pairs of circulant graphs on n nodes.at n=37A054929
• Number of subsets of {1,2,3,...,n} that sum to 0 mod 9.at n=18A068030
• Expansion of (1+x)^3/((1+x)^3+x^4).at n=23A099531
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+x+y>2.at n=20A211614
• a(n) = -(1/n) * Sum_{d|n} phi(n/d) * (-4)^d.at n=8A343466