1822766520
domain: N
Appears in sequences
- a(n) = binomial(3*n,n)/(2*n+1) (enumerates ternary trees and also noncrossing trees).at n=14A001764
- 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=28A047749
- a(n) = A047760(2n+1).at n=27A047761
- a(n) = binomial(prime(n),n)/prime(n) where prime(n) = n-th prime.at n=13A075872
- Interpolation of A001764(n+1) and A006629(n).at n=26A124817
- a(n) = binomial(6*n, 2*n) / (4*n + 1).at n=7A235534
- a(n) = binomial(A007310(n+1),n)/A007310(n+1).at n=14A367520