5036741domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (1,1) steps in all peakless Motzkin paths of length n.at n=16A1102391/8 the number of permutations of 3 indistinguishable copies of 1..n with exactly 4 local maxima.at n=4A152501Prime numbersat n=350877