493506domain: NAppears in sequencesa(n) is the number of Dyck paths of semilength n+6 having its first peak at height n+1.at n=29A005557a(n) = n*(n+1)*(n+2)*(n+3)/4.at n=36A033487Largest x such that 1/x + 1/y + 1/z = 1/n.at n=25A082986a(n) = n*(n+1)*(n*(n+1)+1).at n=27A169938a(n) = n^4 + 6n^3 + 14n^2 + 15n + 6.at n=25A176780