23841480
domain: N
Appears in sequences
- a(n) = binomial(3*n+1,n)/(n+1).at n=11A006013
- Number of necklaces with 12 black beads and n-12 white beads.at n=23A032197
- Duplicate of A006013.at n=11A046648
- If n = 2*m then a(n) = binomial(3*m, m)/(2*m+1), if n=2*m+1 then a(n) = binomial(3*m+1, m+1)/(2*m+1).at n=23A047749
- Number of dissectable polyhedra with n tetrahedral cells and symmetry of type P.at n=45A047765
- a(n) = A047765(2n).at n=22A047767
- Expansion of reversion of (x - 2*x^2) / (1 - x)^3.at n=22A134565
- Number of order ideals of type e^(0)_n.at n=20A299294
- Number of primitive (1,1) pairs in the Fibonacci tree at depth 3n.at n=11A305574
- a(n) = binomial(A007310(n+1),n+1)/A007310(n+1).at n=11A367521