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A006779
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Number of n-step spirals on cubic lattice.
(Formerly M4121)
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3
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1, 6, 18, 54, 150, 426, 1158, 3204, 8682, 23724, 64194, 174378, 470856, 1274430, 3434826, 9272346, 24953004, 67230288, 180705126, 486152604, 1305430884, 3507947838, 9412114986, 25268587338, 67752451146, 181754458194, 487060621596, 1305761069730, 3497441209182
(list;
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listen;
history;
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OFFSET
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0,2
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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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