93339173domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of ways to tile a 2 X n board with squares and dominoes where vertical dominoes are only allowed in even-numbered locations.at n=18A355327Number of ways to tile a hexagonal strip made up of 4*n equilateral triangles, using triangles and diamonds.at n=9A356622Prime numbersat n=5399136