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A006814
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Related to self-avoiding walks on square lattice.
(Formerly M4145)
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3
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1, 6, 21, 76, 249, 814, 2521, 7824, 23473, 70590, 207345, 610356, 1765959, 511006, 14643993, 41958852, 118976633, 337823486, 951157365, 2681163492, 7505218171, 21030311474
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history;
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OFFSET
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1,2
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COMMENTS
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After constructing a self-avoiding walk, bridge together all adjacent neighboring sites on the walk. Then imagine a current flowing through the resulting structure. This sequence is the sum of the number of links carrying the full current across all walks of length n. - Sean A. Irvine, Aug 08 2017
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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CROSSREFS
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KEYWORD
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nonn,walk
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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