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A001478
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The negative integers.
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7
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-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19, -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, -30, -31, -32, -33, -34, -35, -36, -37, -38, -39, -40, -41, -42, -43, -44, -45, -46, -47, -48, -49, -50, -51, -52, -53, -54, -55, -56, -57, -58, -59, -60, -61, -62, -63, -64, -65
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = -n.
G.f.: -x/(1-x)^2.
G.f. A(x) satisfies A(x) + A(-x) = 4A(x^2), A(x)A(-x) = A(x^2), A(x)^2 + A(x^2) = 4A(x)A(x^2). - Michael Somos, Mar 23 2004
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MAPLE
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MATHEMATICA
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PROG
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(PARI) a(n)=-n
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CROSSREFS
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KEYWORD
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core,sign,easy
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AUTHOR
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STATUS
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approved
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