108964domain: NAppears in sequencesNumbers k such that k-3, k-5, k-17, k-257, and k-65537 are all primes.at n=22A063825Number of LL's in all skew Dyck paths of semilength n.at n=10A128726Walks with n steps on the x-axis using steps {1,0,-1} and visiting no point more than twice.at n=18A212589