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Wedderburn-Etherington Number

Wedderburn-Etherington Number

Paperback

General Mathematics

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ISBN10: 6138739345
ISBN13: 9786138739340
Publisher: Sess Pr
Pages: 60
Weight: 0.22
Height: 0.14 Width: 5.98 Depth: 9.02
Language: English
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In graph theory, the Wedderburn-Etherington numbers, named for Ivor Malcolm Haddon Etherington and Joseph Wedderburn, count how many weak binary trees can be constructed: that is, the number of trees for which each graph vertex (not counting the root) is adjacent to no more than three other such vertices, for a given number of nodes. The first few Wedderburn-Etherington numbers are: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, ..

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General Mathematics