92205
domain: N
Appears in sequences
- Number of n-bead necklaces (turning over is allowed) where complements are equivalent.at n=23A000011
- Number of self-dual 2-colored necklaces with 2n beads.at n=22A007147
- Bisection of A000011.at n=11A092668
- a(n) = 3*a(n-1) + 2*a(n-2) for n>1, a(0)=2, a(1)=3.at n=9A206776
- a(n) = Sum_{k=0..n} 4^k * binomial(n,k) * binomial(n+2,k).at n=5A388205