ã¿ãªãããããã¢ã«ã´ãªãºã ã®è¨ç®éã®ä¸éå¤ãä¸éå¤ãèãã¦ããã¨ãã«èªåã§æ°åã®ä¸è¬å¼ãæ±ãããã¨ããã¾ãããï¼ãããªããªãã«John H. Conway and Richard K. Guyè, æ ¹ä¸ çä¹è¨³ï¼æ°ã®æ¬ã«ç´¹ä»ããã¦ãã¾ãããæ°åãã¼ã¿ãã¼ã¹ããç´¹ä»ãããã¾ãã On-Line Encyclopedia of Integer Sequences ãã®æ°åãã¼ã¿ãã¼ã¹ã¯ãã¼ã¯ã¼ããæ°åãæ¤ç´¢ãã¼ã¨ãã¦ç»é²ããã¦ãããã¼ã¿ãã¼ã¹ã®ä¸ããæ¤ç´¢ããã¦ããã¾ãã ä¾ãã°ãæ·±ãnã®ã©ãã«ãªãäºåæ¨ã®ç¨®é¡æ°ã¯ã`1, 3, 21, 651, 457653'ã¨ããæ°åã«ãªãã¾ãããããæ¤ç´¢ãã¼ã¨ãã¦æ¤ç´¢ããã¨ä»¥ä¸ã®ãããªæ¤ç´¢çµæãã§ã¾ãã Number of binary trees of height n; or products (ways to insert parentheses)
{{#tags}}- {{label}}
{{/tags}}