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A303742
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Number of unlabeled oriented edge-rooted 2-trees which have n triangles.
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2
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1, 1, 1, 2, 7, 18, 68, 251, 1020, 4258, 18580, 82716, 377207, 1748250, 8227066, 39197164, 188824506, 918333933, 4504366940, 22260929867, 110763984273, 554510459987, 2791460440109, 14123739733754, 71792405634223, 366483503897357, 1878163540497162, 9660232634407657
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,4
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LINKS
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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