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 A318778 Number of different positions that a elementary sphinx can occupy in a sphinx of order n. 2
 1, 28, 128, 300, 544, 860, 1248, 1708, 2240, 2844 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Craig Knecht, Order Two Sphinx - 28 positions. Craig Knecht, Order three sphinx - 128 positions. Craig Knecht, Various shapes positioned in a order 4 sphinx. FORMULA Conjectures from Colin Barker, Nov 13 2018: (Start) G.f.: x*(1 + 25*x + 47*x^2 - x^3) / (1 - x)^3. a(n) = 44 - 80*n + 36*n^2 for n>1. a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>4. (End) CROSSREFS Cf. A279887, A317541, A318897. Sequence in context: A045823 A044360 A044741 * A184679 A123376 A192796 Adjacent sequences:  A318775 A318776 A318777 * A318779 A318780 A318781 KEYWORD nonn,more AUTHOR Craig Knecht, Sep 10 2018 STATUS approved

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Last modified June 26 10:12 EDT 2019. Contains 324375 sequences. (Running on oeis4.)