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Search: id:A051485
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| A051485 |
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Number of double nodes (exactly two nodes on that level) for all Motzkin paths of length n. |
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+0
1
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| 0, 1, 1, 2, 6, 14, 32, 74, 180, 457, 1195, 3177, 8526, 23018, 62441, 170153
(list; graph; listen)
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OFFSET
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0,4
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REFERENCES
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Wen-jin Woan, "Unilevel Points Via Generating Functions", preprint, 1999.
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EXAMPLE
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Of the 9 Motzkin paths of length 4 the following 5 have a total of 6 double nodes:
|1......|
|2../\..|3..__..|2.._...|2..._..|2......|
|2./..\.|2./..\.|3./.\_.|3._/.\.|3./\/\.|
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CROSSREFS
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Sequence in context: A074878 A065495 A131352 this_sequence A077999 A110524 A083404
Adjacent sequences: A051482 A051483 A051484 this_sequence A051486 A051487 A051488
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KEYWORD
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nonn
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AUTHOR
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Wen-jin Woan (wwoan(AT)howard.edu)
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EXTENSIONS
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Edited by Michael Somos, Sep 29, 2003
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