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A039658
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Related to enumeration of edge-rooted catafusenes.
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1
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0, 1, 2, 5, 8, 18, 28, 64, 100, 237, 374, 917, 1460, 3679, 5898, 15183, 24468, 64055, 103642, 275011, 446380, 1197616, 1948852, 5277070, 8605288, 23483743, 38362198, 105392983, 172423768, 476459938, 780496108, 2167743688, 3554991268
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| S. J. Cyvin et al., Enumeration and classification of benzenoid systems. 32. Normal perifusenes with two internal vertices, J. Chem. Inform. Comput. Sci., 32 (1992), 532-540.
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.: (1+x)[1-3x^2-sqrt(1-6x^2+5x^4)]/[2x^2(1-x)] (eq. (9) in Cyvin et al.)
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CROSSREFS
| Sequence in context: A086324 A073708 A024460 * A063675 A000943 A152006
Adjacent sequences: A039655 A039656 A039657 * A039659 A039660 A039661
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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 14 2004
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