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A292215
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Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes or outdegrees larger than nine.
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2
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0, 1, 1, 2, 5, 12, 33, 90, 261, 766, 2311, 7065, 21955, 68921, 218640, 699161, 2252410, 7301482, 23802026, 77973162, 256565366, 847555502, 2809934472, 9346232579, 31179372180, 104298865434, 349766936468, 1175657140783, 3960143985167, 13366048810561
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OFFSET
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0,4
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LINKS
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MAPLE
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b:= proc(n, i, v) option remember; `if`(n=0,
`if`(v=0, 1, 0), `if`(i<1 or v<1 or n<v, 0,
`if`(v=n, 1, add(binomial(a(i)+j-1, j)*
b(n-i*j, i-1, v-j), j=0..min(n/i, v)))))
end:
a:= proc(n) option remember; `if`(n<2, n,
add(b(n, n+1-j, j), j=2..min(n, 9)))
end:
seq(a(n), n=0..35);
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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