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A066368
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(n+2)*2^(n-1)-2*n.
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2
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1, 1, 4, 14, 40, 102, 244, 562, 1264, 2798, 6124, 13290, 28648, 61414, 131044, 278498, 589792, 1245150, 2621404, 5504986, 11534296, 24117206, 50331604, 104857554, 218103760, 452984782, 939524044, 1946157002, 4026531784
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0..200
M. Azaola and F. Santos, The number of triangulations of the cyclic polytope C(n,n-4), Discrete Comput. Geom., 27 (2002), 29-48.
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FORMULA
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G.f.: (1-5*x+11*x^2-9*x^3)/((1-x)^2*(1-2*x)^2). [Colin Barker, Apr 19 2012]
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PROG
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(PARI) { for (n=0, 200, write("b066368.txt", n, " ", (n + 2)*2^(n - 1) - 2*n) ) } [From Harry J. Smith, Feb 11 2010]
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CROSSREFS
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Sequence in context: A066375 A093160 A001938 * A160463 A121593 A160527
Adjacent sequences: A066365 A066366 A066367 * A066369 A066370 A066371
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, Jan 04 2002
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STATUS
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approved
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