a(n) = A000262(n)^2.A276960a(n) = A000262(n)^2.Terms a(0) =1a(1) =1a(2) =9a(3) =169a(4) =5329a(5) =251001a(6) =16410601a(7) =1416242689a(8) =155514288609External referencesoeis: A276960