75015domain: NAppears in sequencesExpansion of 1/(1-5*x+x^3).at n=7A099504Number of double rises at an even level in all nondecreasing Dyck paths of semilength n. A nondecreasing Dyck path is a Dyck path for which the sequence of the altitudes of the valleys is nondecreasing.at n=11A121532