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approved
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approved
a(n) - a(n-1) = A001254(n).
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reviewed
approved
proposed
reviewed
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proposed
Simon Plouffe, <a href="https://arxiv.org/abs/0911.4975">Approximations de séries génératrices et quelques conjectures</a>, Dissertation, Université du Québec à Montréal, 1992, ; arXiv:0911.4975 [math.NT], 2009.
proposed
editing
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proposed
G.f.: [(1+7x7*x-4x4*x^2])/[((1-x)*(1+x)*(1-3x3*x+x^2)]). - Simon Plouffe in his 1992 dissertation
a(n) = L(n)*L(n+1) - 2 = A215602(n) - 2. (End)
proposed
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editing
proposed