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A118442
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Column 0 of triangle A118441, which is the matrix log of triangle A118435.
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5
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0, 1, -4, -12, 32, 80, -192, -448, 1024, 2304, -5120, -11264, 24576, 53248, -114688, -245760, 524288, 1114112, -2359296, -4980736, 10485760, 22020096, -46137344, -96468992, 201326592, 419430400, -872415232, -1811939328, 3758096384, 7784628224, -16106127360, -33285996544
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OFFSET
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0,3
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LINKS
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FORMULA
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G.f.: x*(1 - 4*x - 4*x^2)/(1 + 4*x^2)^2.
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MATHEMATICA
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LinearRecurrence[{0, -8, 0, -16}, {0, 1, -4, -12}, 40] (* Harvey P. Dale, Dec 29 2014 *)
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PROG
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(PARI) {a(n)=polcoeff(x*(1 - 4*x - 4*x^2)/(1 + 4*x^2 +x*O(x^n))^2, n)}
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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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STATUS
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approved
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