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A038578
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Number of self-avoiding closed walks from 0 of area n in strip Z X {-1,0,1}.
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1
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1, 8, 16, 40, 88, 184, 388, 800, 1628, 3288, 6584, 13096, 25904, 50984, 99916, 195072, 379572, 736360, 1424672, 2749672, 5295240, 10176856, 19522644, 37387424, 71487756, 136492216, 260255304, 495618408, 942731360, 1791241544, 3399976348
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| J. Labelle, Self-avoiding walks and polyominoes in strips, Bull. ICA, 23 (1998), 88-98.
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FORMULA
| G.f.=-3+4(1-x^2+x^4)/(1-x-x^2-x^3)^2 [Labelle]. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 29 2004
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CROSSREFS
| Cf. A022444.
Sequence in context: A024700 A108576 A052207 * A155110 A022444 A089828
Adjacent sequences: A038575 A038576 A038577 * A038579 A038580 A038581
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KEYWORD
| nonn,walk,easy
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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), Apr 29 2004
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