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A007017 Number of motifs in triangular window of side n.
(Formerly M2935)
2

%I M2935

%S 1,3,12,65,480,4851,67256,1281258,33576120,1211321683,60197760876,

%T 4122762095127,389255776509600,50680509287223315,9101288287232978112,

%U 2254758094831392182844

%N Number of motifs in triangular window of side n.

%C 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

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%D 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.

%H R. H. Hardin, <a href="/A007017/b007017.txt">Table of n, a(n) for n = 0..19</a>

%H G. Rauzy, <a href="/A007017/a007017.pdf">Notes/Letter to N. J. A. Sloane, n.d.</a>

%K nonn

%O 0,2

%A G. Rauzy

%E More terms from I. Gambini and L. Vuillon (vuillon(AT)lmd.univ-mrs.fr)

%E Offset set to 0 to match comment and b-file - _R. J. Mathar_, Oct 22 2010

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Last modified September 16 08:14 EDT 2021. Contains 347469 sequences. (Running on oeis4.)