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A058735
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Triangle of coefficients in expansion of enumerators for series-reduced rooted trees by lines at the root.
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2
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1, 1, 1, 1, 1, 3, 1, 1, 3, 7, 1, 1, 3, 8, 20, 1, 1, 3, 8, 22, 55, 1, 1, 3, 8, 23, 63, 162, 1, 1, 3, 8, 23, 65, 188, 477, 1, 1, 3, 8, 23, 66, 196, 564, 1450, 1, 1, 3, 8, 23, 66, 198, 590, 1732, 4446, 1, 1, 3, 8, 23, 66, 199, 598, 1824, 5384, 13858, 1, 1, 3, 8, 23, 66, 199, 600, 1850
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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REFERENCES
| J. Riordan, The blossoming of Schroeder's fourth problem, Acta Math., 137 (1976), 1-16.
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LINKS
| Index entries for sequences related to rooted trees
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EXAMPLE
| 1; 1,1; 1,1,3; 1,1,3,7; ...
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CROSSREFS
| Main diagonal is A058737.
Sequence in context: A121745 A089312 A125127 * A107294 A161788 A170819
Adjacent sequences: A058732 A058733 A058734 * A058736 A058737 A058738
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KEYWORD
| nonn,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2001
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), May 07 2005
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