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A157241
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G.f. x/((1-x)*(4*x^2-2*x+1))
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2
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0, 1, 3, 3, -5, -21, -21, 43, 171, 171, -341, -1365, -1365, 2731, 10923, 10923, -21845, -87381, -87381, 174763, 699051, 699051, -1398101, -5592405, -5592405, 11184811, 44739243, 44739243, -89478485, -357913941
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Generating floretion is Y = .5('i + 'j + 'k + i' + j' + k') + ee. ("ibasek"). This is the same floretion which generates A157240.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,-6,4).
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FORMULA
| a(n+1)-a(n) = A088138(n+1).
a(n+1)=Sum_{0<=k<=n} A120987(n,k)*(-1)^(n-k). - From DELEHAM Philippe, Oct 25 2011.
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MATHEMATICA
| Join[{a=0, b=1}, Table[c=2*b-4*a+1; a=b; b=c, {n, 60}]] (*From Vladimir Joseph Stephan Orlovsky, Feb 01 2011*)
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CROSSREFS
| A128018, A157240
Sequence in context: A144423 A128636 A123633 * A196430 A201496 A110426
Adjacent sequences: A157238 A157239 A157240 * A157242 A157243 A157244
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KEYWORD
| easy,sign
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AUTHOR
| Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Feb 25 2009
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