664631domain: NAppears in sequencesTriangle read by rows: number of Dyck paths of semilength n having k 3-bridges of a given shape (0<=k<=floor(n/3)). A 3-bridge is a subpath of the form UUUDDD or UUDUDD starting at level 0.at n=46A114499Numbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 7.at n=24A137025