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A045906
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Catafusenes (see reference for precise definition).
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1
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1, 1, 4, 12, 51, 205, 907, 4000, 18048, 81719, 373104, 1710740, 7882346, 36457711, 169252176, 788326910, 3683071949, 17255713627, 81056265252, 381668770108, 1801189604231, 8517995996495, 40360819400887, 191589552910532
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| S. J. Cyvin et al., Enumeration and classification of certain polygonal systems... : annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180.
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FORMULA
| G.f.: (8*(1+x^2-6*x^3-x^4)-(1-3*x)*(1-x)^(5/2)*(1-5*x)^(1/2)-(1-x)^(-1)*(5+3*x-5*x^2-7*x^3)*(1-x^2)^(1/2)*(1-5*x^2)^(1/2)-2*(1-x^4)^(1/2)*(1-5*x^4)^(1/2))/16/x^4 - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 13 2004
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CROSSREFS
| Sequence in context: A149400 A149401 A149402 * A025282 A149403 A127866
Adjacent sequences: A045903 A045904 A045905 * A045907 A045908 A045909
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 13 2004
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