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A039660
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Related to enumeration of edge-rooted catafusenes.
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0
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0, 0, 0, 1, 2, 8, 14, 43, 72, 204, 336, 926, 1516, 4144, 6772, 18504, 30236, 82844, 135452, 372581, 609710, 1684220, 2758730, 7652531, 12546332, 34941752, 57337172, 160280987, 263224802, 738363872, 1213502942, 3414804517
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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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.
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FORMULA
| G.f.: (1+x)[1-6x^2+7x^4-(1-3x^2)sqrt(1-6x^2+5x^4)]/[2x^4(1-x)] (eq. (11) in Cyvin et al.)
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CROSSREFS
| Sequence in context: A046959 A086177 A162484 * A119752 A111001 A055258
Adjacent sequences: A039657 A039658 A039659 * A039661 A039662 A039663
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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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