A031148 Number of series-reduced planted trees with n leaves of 2 colors and no symmetries.

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

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