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A140290
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Fourth quadrisection of A140287.
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1
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-1, 2, -4, 9, -25, 82, -284, 969, -3185, 10082, -30964, 93129, -276745, 818482, -2421644, 7188489, -21428705, 64121282, -192388324, 578087049, -1737827065, 5223134482, -15690187004, 47105428809, -141351839825, 424023394082, -1271763913684
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listen;
history;
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internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n)=-7a(n-1)-17a(n-2)-15a(n-3).
G.f.: -(7*x^2+5*x+1)/((3*x+1)*(5*x^2+4*x+1)). - Colin Barker, Jul 10 2012
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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