A031148 - OEIS

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A031148

Number of series-reduced planted trees with n leaves of 2 colors and no symmetries.

3

2, 1, 2, 5, 14, 43, 138, 455, 1540, 5305, 18546, 65616, 234546, 845683, 3072350, 11235393, 41326470, 152793376, 567518950, 2116666670, 7924062430, 29765741831, 112157686170, 423809991041, 1605622028100

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

N. J. A. Sloane, Transforms

Index entries for sequences related to rooted trees

FORMULA

Doubles (index 2+) under WEIGH transform.

CROSSREFS

Essentially the same as A052301. Cf. A000669, A001678, A038075, A050381.

Sequence in context: A279955 A280339 A115141 * A032238 A000619 A006602

Adjacent sequences: A031145 A031146 A031147 * A031149 A031150 A031151

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

STATUS

approved