31983672534
domain: N
Appears in sequences
- a(n) = binomial(3*n+1,n)/(n+1).at n=15A006013
- 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=31A047749
- Expansion of reversion of (x - 2*x^2) / (1 - x)^3.at n=30A134565
- Number of primitive (1,1) pairs in the Fibonacci tree at depth 3n.at n=15A305574
- a(n) = binomial(A007310(n+1),n+1)/A007310(n+1).at n=15A367521