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A176452
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Irregular triangle read by rows: T(n,k) = number of Huffman-equivalence classes of ternary trees with 2n+1 leaves and 3k leaves on the bottom level (n>=1, k>=1).
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3
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1, 1, 1, 1, 2, 1, 1, 4, 2, 1, 7, 4, 2, 13, 7, 4, 1, 25, 13, 7, 2, 1, 48, 25, 13, 3, 2, 1, 92, 48, 25, 6, 3, 2, 176, 92, 48, 12, 6, 3, 1, 338, 176, 92, 23, 12, 6, 1
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OFFSET
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1,5
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REFERENCES
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J. Paschke et al., Computing and estimating the number of n-ary Huffman sequences of a specified length, Discrete Math., 311 (2011), 1-7.
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LINKS
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EXAMPLE
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Triangle begins:
1
1
1 1
2 1 1
4 2 1
7 4 2
13 7 4 1
25 13 7 2 1
48 25 13 3 2 1
92 48 25 6 3 2
176 92 48 12 6 3 1
338 176 92 23 12 6 1
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CROSSREFS
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KEYWORD
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nonn,more,tabf
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AUTHOR
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STATUS
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approved
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