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A262673
Number of pointed trees on normal pointed multisets of weight n.
6
1, 3, 34, 615, 15410, 494018
OFFSET
1,2
COMMENTS
A pointed multiset is normal if its entries span an initial interval of positive integers.
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