韦德伯恩-埃瑟林顿数

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图论中,韦德伯恩-埃瑟林顿数是由计算每张图有多少弱二叉树问题而得出的數列。 最初的几个韦德伯恩-埃瑟林顿数为: 1, 1, 1, 2, 3, 6, 11, 23, 46, 98, 207, 451, 983, 2179, 4850, 10905, 24631, 56011, 127912, 293547, 676157, 1563372, 3626149, 8436379, 19680277, 46026618, 107890609, 253450711, 596572387, 1406818759, 3323236238, 7862958391,... (OEIS中的数列A001190

名字由來[编辑]

韦德伯恩-埃瑟林顿数的名字由來是兩個數學家艾弗·马尔科姆·哈顿埃瑟林顿约瑟夫·韦德伯恩

參考資料[编辑]

  • OEIS.A001190
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  • I. M. H. Etherington, "On non-associative combinations," Proc. Royal Soc. Edinburgh, 59 2 (1939): 153–162.
  • S. R. Finch, Mathematical Constants. Cambridge: Cambridge University Press (2003): 295–316
  • F. Murtagh, "Counting dendrograms: a survey," Discrete Applied Mathematics 7 (1984): 191–199
  • J. H. M. Wedderburn, "The functional equation " Ann. Math. 24 (1923): 121–140