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

Author

Christian G. Bower

Keywords

• nonn
• eigen

Links

• N. J. A. Sloane, Transforms
• Index entries for sequences related to rooted trees

Crossrefs

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

Formula

Doubles (index 2+) under WEIGH transform.