166871334960domain: NAppears in sequencesa(n) = binomial(3*n, n - 1).at n=14A004319Binomial coefficient C(45,n).at n=14A010961Binomial coefficient C(n,31).at n=14A010984a(n) = binomial(floor((3n+4)/2),floor(n/2)).at n=29A127040a(n) = Sum_{j=1..floor(n/2)} binomial(n+j-1,j-1).at n=29A175167