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A126886
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Triangle read by rows, arising in enumeration of 4-trees by diameter.
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0
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1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 5, 6, 8, 7, 7, 5, 5, 3, 2, 1, 1, 1, 2, 7, 12, 23, 30, 42, 47, 55, 53, 53, 45, 40, 29, 23
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,8
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COMMENTS
| See reference for precise definition.
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REFERENCES
| A. T. Balaban, J. W. Kennedy and L. V. Quintas, The number of alkanes having n carbons and a longest chain of length d, J. Chem. Education, 65 (No. 4, 1988), 304-313.
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EXAMPLE
| Triangle begins:
1
1
1 1 1
1 1 2 1 1
1 2 5 6 8 7 7 5 5 3 2 1 1
1 2 7 12 23 30 42 47 55 53 53 45 40 29 23 ...
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CROSSREFS
| Cf. A000602 (diagonal sums when rows are displaced by the appropriate amounts), A036437.
Sequence in context: A026148 A117211 A061545 * A179272 A165680 A105685
Adjacent sequences: A126883 A126884 A126885 * A126887 A126888 A126889
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KEYWORD
| nonn,tabf
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Aug 04 2007
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