142498692
domain: N
Appears in sequences
- a(n) = binomial(3*n+1,n)/(n+1).at n=12A006013
- Duplicate of A006013.at n=12A046648
- 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=25A047749
- Expansion of reversion of (x - 2*x^2) / (1 - x)^3.at n=24A134565
- Number of order ideals of type e^(0)_n.at n=22A299294
- Number of primitive (1,1) pairs in the Fibonacci tree at depth 3n.at n=12A305574