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A007017
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Number of motifs in triangular window of side n.
(Formerly M2935)
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1
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1, 3, 12, 65, 480, 4851, 67256, 1281258, 33576120, 1211321683, 60197760876, 4122762095127, 389255776509600, 50680509287223315, 9101288287232978112, 2254758094831392182844
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Also, half the number of (n+1)X(n+1)X(n+1) triangular binary arrays with no upright or inverted 2X2X2 subtriangle that is all 0's or all 1's. - R. H. Hardin, Oct 22, 2010.
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
L. Vuillon (vuillon(AT)lmd.univ-mrs.fr), "Contribution a l'etude des pavages et des surfaces dicretisees", Dissertation, Universite de la mediterranee, Marseille, France 1996.
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LINKS
| R. H. Hardin, Table of n, a(n) for n = 0..19
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CROSSREFS
| Sequence in context: A200309 A109577 A144297 * A183273 A082987 A086836
Adjacent sequences: A007014 A007015 A007016 * A007018 A007019 A007020
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KEYWORD
| nonn
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AUTHOR
| G. Rauzy
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EXTENSIONS
| More terms from I. Gambini and L. Vuillon (vuillon(AT)lmd.univ-mrs.fr).
Offset set to 0 to match comment and b-file - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 22 2010
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