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A143108
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Let H(2,d) be the space of polynomials p(x,y) of two variables with nonnegative coefficients such that p(x,y)=1 whenever x + y = 1. a(n) is the number of different polynomials in H(2,d) with exactly n distinct monomials and of maximum degree minus 1, i.e., of degree 2n-4.
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2
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OFFSET
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1,3
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LINKS
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FORMULA
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Possibly can be computed from A143107 except for the third term, but this is not proved. Let b_n be elements of A143107, then a_n = 2 ( b_2 b_{n-1} + b_3 b_{n-2} + ... + b_{n-1} b_2 ).
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MATHEMATICA
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See the paper by Lebl-Lichtblau.
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CROSSREFS
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KEYWORD
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hard,nonn,more
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AUTHOR
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Jiri Lebl (jlebl(AT)math.uiuc.edu), Jul 25 2008
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STATUS
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approved
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