8140539950domain: NAppears in sequencesBinomial transform of Catalan numbers.at n=17A007317Least nondecreasing sequence with a(1) = 1 and Hankel transform {1,1,1,1,...}.at n=34A055879Least nondecreasing sequence with a(1) = 1 and Hankel transform {1,1,1,1,...}.at n=35A055879G.f.: (1/2)*(3 - sqrt((1-5*x)/(1-x))).at n=18A181768