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Search: id:A132441
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| A132441 |
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Number of 3-noncrossing stack-free partial matching without 1-arcs. |
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+0
3
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| 1, 1, 2, 5, 12, 31, 88, 263, 814, 2604, 8575, 28936, 99726, 350151, 1249865
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OFFSET
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1,3
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REFERENCES
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Emma Y. Jin and Christian M. Reidys. RNA-Lego: Combinatorial design of pseudoknot RNA, Bull. Math. Bio. 2007, submit
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FORMULA
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C_k(n,h)= sum_{b=0}^{h-1}(-1)^{h-b-1}{h-1 Choose b}{T}_k(h-2h+2b+2,b+1)
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CROSSREFS
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Sequence in context: A014329 A045633 A090826 this_sequence A000840 A162434 A039809
Adjacent sequences: A132438 A132439 A132440 this_sequence A132442 A132443 A132444
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KEYWORD
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nonn
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AUTHOR
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Emma. Y. Jin (emma(AT)cfc.nankai.edu.cn), Nov 13 2007
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