42038domain: NAppears in sequencesa(1) = a(2) = 1. For n >= 3, a(n) = 1 + A114600(n-2)*A114600(n-1).at n=17A114599Floor-Sqrt transform of Catalan numbers (A000108).at n=19A186546Numbers n such that the trinomial x^n-x-1 is irreducible over GF(3).at n=38A223938