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Search: id:A073496
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| 3, -1, -5, 11, 3, -41, 43, 83, -253, 47, 795, -1189, -1149, 5511, -3253, -14429, 29699, 10335, -113861, 112555, 239363, -690889, 85355, 2226675, -3173629, -3421041, 15168603, -8079109, -40847741, 80253671, 34210443, -315819197, 293441539, 688226495, -1884370309, 113132363, 6228205059
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(2n)=-a(2n-2)-3a(2n-4)+a(2n-6), a(0)=3, a(2)=-1, a(4)=-5. O.g.f. (3 + 2*x + 3*x^2)/(1 + x + 3*x^2 - x^3).
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MATHEMATICA
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CoefficientList[Series[(3 + 2*x + 3*x^2)/(1 + x + 3*x^2 - x^3), {x, 0, 50}], x]
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CROSSREFS
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Cf. A073145.
Sequence in context: A093905 A063853 A105064 this_sequence A091623 A059616 A125053
Adjacent sequences: A073493 A073494 A073495 this_sequence A073497 A073498 A073499
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KEYWORD
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easy,sign
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Aug 03 2002
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