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A127021
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Number of rhyme schemes (see reference for precise definition).
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2
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1, 11, 80, 491, 2777, 15120, 81371, 440947, 2441334, 13976885, 83547881, 525082654, 3483272777, 24413200487, 180517606216, 1404147099951, 11449330342717, 97521479081952, 864955731435983, 7966538662094103
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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REFERENCES
| J. Riordan, A budget of rhyme scheme counts, pp. 455 - 465 of Second International Conference on Combinatorial Mathematics, New York, April 4-7, 1978. Edited by Allan Gewirtz and Louis V. Quintas. Annals New York Academy of Sciences, 319, 1979.
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LINKS
| J. Riordan, Cached copy of paper
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FORMULA
| a(k)=1. a(n)=k*a(n-1)+A000110(n-1)-A102661(n-1,k-2), k=4.
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CROSSREFS
| Cf. A005002, A005003.
Sequence in context: A159663 A026897 A021024 * A091098 A091115 A024146
Adjacent sequences: A127018 A127019 A127020 * A127022 A127023 A127024
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KEYWORD
| nonn
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AUTHOR
| R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 15 2008
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