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A007017 Number of motifs in triangular window of side n.
(Formerly M2935)
2
1, 3, 12, 65, 480, 4851, 67256, 1281258, 33576120, 1211321683, 60197760876, 4122762095127, 389255776509600, 50680509287223315, 9101288287232978112, 2254758094831392182844 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also, half the number of (n+1) X (n+1) X (n+1) triangular binary arrays with no upright or inverted 2 X 2 X 2 subtriangle that is all 0's or all 1's. - R. H. Hardin, Oct 22 2010

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.

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..19

CROSSREFS

Sequence in context: A109577 A242575 A144297 * A183273 A082987 A086836

Adjacent sequences:  A007014 A007015 A007016 * A007018 A007019 A007020

KEYWORD

nonn

AUTHOR

G. Rauzy

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, Oct 22 2010

STATUS

approved

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Last modified December 8 21:06 EST 2016. Contains 278956 sequences.