2922259domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of Dyck n-paths with ascents and descents of length equal to 1 (mod 4).at n=30A023427G.f. satisfies: A(x) = (1 + x*A(x)) * (1 + x^4*A(x)).at n=29A216116Prime numbersat n=211608