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A038381
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Number of perifusenes with one internal vertex.
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0
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0, 0, 0, 0, 1, 4, 23, 103, 477, 2132, 9647, 43549, 197757, 901162, 4125636, 18962997, 87508095, 405285316, 1883445191, 8780327545, 41052409755, 192461538607, 904573028990, 4261485478861, 20119936933822, 95186854957397
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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REFERENCES
| S. J. Cyvin et al., Number of perifusenes with one internal vertex, Rev. Roumaine Chem., 38 (1993), 65-77.
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FORMULA
| G.f.=(1-11x+21x^2-9x^3)/2-(4-18x+17x^2)*(1-x)^(1/2)*(1-5x)^(1/2)/6+x(1-x^2)^(1/2)*(1-5x^2)^(1/2)/2+(1-x^3)^(1/2)*(1-5x^3)^(1/2)/6. - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 14 2004
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CROSSREFS
| Sequence in context: A014585 A197854 A122738 * A082970 A197868 A017973
Adjacent sequences: A038378 A038379 A038380 * A038382 A038383 A038384
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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), May 14 2004
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