A262673 - OEIS

A262673

Number of pointed trees on normal pointed multisets of weight n.

1, 3, 34, 615, 15410, 494018

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OFFSET

1,2

COMMENTS

A pointed multiset is normal if its entries span an initial interval of positive integers.

LINKS

EXAMPLE

The a(2) = 3 pointed trees are 1[1 1], 1[1 2], 2[1 2].

The a(3) = 34 pointed trees of the form rootpoint[pointedbranch ... pointedbranch] are:

1[1 1[1 1]], 1[1[1 1] 1], 1[1 1 1],

1[1 2[2 2]], 1[1[1 2] 2], 1[1 2 2],

2[1 2[2 2]], 2[1[1 2] 2], 2[2 2[1 2]], 2[2[1 2] 2], 2[1 2 2],

1[1 1[1 2]], 1[1 2[1 2]], 1[1[1 1] 2], 1[1[1 2] 1], 1[1 1 2],

2[1 2[1 2]], 2[1[1 1] 2], 2[1 1 2],

1[1 2[2 3]], 1[1 3[2 3]], 1[1[1 2] 3], 1[1[1 3] 2], 1[1 2 3],

2[1 2[2 3]], 2[1[1 3] 2], 2[2 3[1 3]], 2[2[1 2] 3], 2[1 2 3],

3[1 3[2 3]], 3[1[1 2] 3], 3[2 3[1 3]], 3[2[1 2] 3], 3[1 2 3].

CROSSREFS

KEYWORD

nonn,more

AUTHOR

Gus Wiseman, Sep 26 2015

STATUS

approved