68328754959
domain: N
Appears in sequences
- a(n) = binomial(3*n,n)/(2*n+1) (enumerates ternary trees and also noncrossing trees).at n=16A001764
- 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=32A047749
- Interpolation of A001764(n+1) and A006629(n).at n=30A124817
- a(n) = binomial(6*n, 2*n) / (4*n + 1).at n=8A235534
- a(n) = binomial(A007310(n+1),n)/A007310(n+1).at n=16A367520