11124755664
domain: N
Appears in sequences
- a(n) = binomial(3*n,n)/(2*n+1) (enumerates ternary trees and also noncrossing trees).at n=15A001764
- 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=30A047749
- a(n) = A047760(2n+1).at n=29A047761
- a(n) = A047765(2n).at n=29A047767
- Interpolation of A001764(n+1) and A006629(n).at n=28A124817
- Expansion of series reversion of generating function for triangular numbers.at n=15A179848
- a(n) = binomial(9*n, 3*n) / (6*n + 1).at n=5A235535