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Search: id:A075298
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| 1, 1, -5, 5, 1, -11, 15, -3, -23, 41, -21, -43, 105, -83, -65, 253, -271, -47, 571, -795, 177, 1189, -2161, 1149, 2201, -5511, 4459, 3253, -13223, 14429, 2047, -29699, 42081, -10335, -61445, 113861, -62751, -112555, 289167, -239363, -162359, 690889, -767893, -85355, 1544137, -2226675, 597183, 3173629
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OFFSET
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0,3
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COMMENT
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a(n)=-C(n+1), C(n)=reflected generalized tribonacci numbers A073145.
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FORMULA
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a(n)=-a(n-1)-a(n-2)+a(n-3), a(0)=1, a(1)=1, a(2)=-5. Ogf (1+2x-3x^2)/(1+x+x^2-x^3).
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MATHEMATICA
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CoefficientList[Series[(1+2x-3x^2)/(1+x+x^2-x^3), {x, 0, 40}], x]
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CROSSREFS
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Cf. A001644, A073145, A075193.
Sequence in context: A097566 A014287 A011094 this_sequence A060058 A092766 A060074
Adjacent sequences: A075295 A075296 A075297 this_sequence A075299 A075300 A075301
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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), Sep 13 2002
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