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 A155745 a(n) = number of distinct (n+1)- nonnegative integer vectors describing, up to symmetry, the hyperplanes of the real n-dimensional cube. 0
 1, 1, 2, 3, 7, 21, 143 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Related to the sequence a'(n): 1,1,2,3,7,21,131. The sequence a'(n) has a recursive definition. The following holds: a(n)>a'(n) for n>6. REFERENCES Ilda P. F. da Silva, Recursivity and geometry of the hypercube, Linear Algebra and its Apllications, 397(2005),223-233 LINKS EXAMPLE For n=3 a(3)=2 because the 2 vectors (0,0,1,1) and (1,1,1,1) describe all the real planes spanned by the points of {-1,1}^3. CROSSREFS Cf. A007847 Sequence in context: A189360 A001532 A109456 * A067738 A296287 A187014 Adjacent sequences:  A155742 A155743 A155744 * A155746 A155747 A155748 KEYWORD hard,nonn AUTHOR Ilda P. F. da Silva (isilva(AT)cii.fc.ul.pt), Jan 26 2009 STATUS approved

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Last modified April 18 03:59 EDT 2021. Contains 343072 sequences. (Running on oeis4.)