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A075298
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Inverted (definition in A075193) generalized tribonacci numbers A001644.
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2
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| a(n)=-C(n+1), C(n)=reflected generalized tribonacci numbers A073145.
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FORMULA
| 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
| CoefficientList[Series[(1+2x-3x^2)/(1+x+x^2-x^3), {x, 0, 40}], x]
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CROSSREFS
| Cf. A001644, A073145, A075193.
Sequence in context: A154945 A011094 A204005 * A060058 A092766 A060074
Adjacent sequences: A075295 A075296 A075297 * A075299 A075300 A075301
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KEYWORD
| easy,sign
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AUTHOR
| Mario Catalani (mario.catalani(AT)unito.it), Sep 13 2002
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