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+Your library teacher has a 2-row bookshelf that can contain N books in each row. She wants to know the number of ways that she can fill the bookshelf with red-colored books and blue-colored books such that no 2 red-colored books are adjacent to each other (horizontally or vertically).
+
+Input: the integer, N
+Output: the number of ways you can place red-colored books and blue-colored books onto the bookshelf
+
+Ex: N=3
+
+
+Input: 3
+
+BB
+BB
+
+BB
+BR
+
+BR
+BB
+
+RB
+BB
+
+BB
+RB
+
+RB
+BR
+
+BR
+RB
+
+Output: 6