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A058735 Triangle of coefficients in expansion of enumerators for series-reduced rooted trees by lines at the root. 2
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; text; internal format)
OFFSET

0,6

REFERENCES

J. Riordan, The blossoming of Schroeder's fourth problem, Acta Math., 137 (1976), 1-16.

LINKS

Table of n, a(n) for n=0..74.

Index entries for sequences related to rooted trees

EXAMPLE

1; 1,1; 1,1,3; 1,1,3,7; ...

CROSSREFS

Main diagonal is A058737.

Sequence in context: A252983 A089312 A246674 * A107294 A161788 A170819

Adjacent sequences:  A058732 A058733 A058734 * A058736 A058737 A058738

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Jan 01 2001

EXTENSIONS

More terms from Vladeta Jovovic, May 07 2005

STATUS

approved

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Last modified May 7 16:00 EDT 2021. Contains 343652 sequences. (Running on oeis4.)