10150595910domain: NAppears in sequencesBinomial coefficient C(3n,n-4).at n=11A004322Binomial coefficient C(45,n).at n=11A010961Binomial coefficient C(n,34).at n=11A010987a(n) = (4n+1)*binomial(4n,n)/(3n+1).at n=11A052203Number of dispersed Dyck prefixes of length 2n and height n.at n=22A283799