{"trustable":false,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n #problem-body \u003e pre {\n display: block;\n padding: 9.5px;\n margin: 0 0 10px;\n font-size: 13px;\n line-height: 1.42857143;\n word-break: break-all;\n word-wrap: break-word;\n color: #333;\n background: rgba(255, 255, 255, 0.5);\n border: 1px solid #ccc;\n border-radius: 6px;\n }\n\u003c/style\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003chtml\u003e\n \u003chead\u003e\u003c/head\u003e\n \u003cbody\u003e\n \u003cdiv id\u003d\"problem-body\"\u003e\n \u003cpre\u003e\nIn how many ways can you tile a 3xn rectangle with 2x1 dominoes?\n\nHere is a sample tiling of a 3x12 rectangle.\n\nInput consists of several test cases followed by a line containing -1.\nEach test case is a line containing an integer 0 ≤ n ≤ 30. For each test\ncase, output one integer number giving the number of possible tilings. \n\u003c/pre\u003e \n \u003cimg src\u003d\"CDN_BASE_URL/886fec46d8d895ec81c1ae00f44dac73?v\u003d1596553332\"\u003e \u003cc\u003e \n \u003ch3\u003eSAMPLE INPUT \u003c/h3\u003e \n \u003c/c\u003e \n \u003cpre\u003e\n2\n8\n12\n-1\n\u003c/pre\u003e \n \u003ch3\u003eSAMPLE OUTPUT \u003c/h3\u003e \n \u003cpre\u003e\n3\n153\n2131\n\u003c/pre\u003e \n \u003c/div\u003e\n \u003c/body\u003e\n\u003c/html\u003e"}}]}