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2, 0, 2, -1, 2, -2, 2, -3, 2, -4, 2, -5, 2, -6, 2, -7, 2, -8, 2, -9, 2, -10, 2, -11, 2, -12, 2, -13, 2, -14, 2, -15, 2, -16, 2, -17, 2, -18, 2, -19, 2, -20, 2, -21, 2, -22, 2, -23, 2, -24, 2, -25, 2, -26, 2, -27, 2, -28, 2, -29, 2, -30, 2, -31, 2, -32, 2, -33, 2, -34, 2, -35, 2
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OFFSET
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1,1
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COMMENTS
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A064680(n)+A022998(n-1) =c(n) = 2, 2, 10, 5, 18, 8, 26, 11,.. has differences c(2n)-c(2n-1) = -5*(n-1) = -A008587(n-1).
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LINKS
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Table of n, a(n) for n=1..73.
Index entries for linear recurrences with constant coefficients, signature (0,2,0,-1).
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FORMULA
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a(n) = n/4+3/2-(-1)^n*(n/4+1/2).
a(n)= +2*a(n-2) -a(n-4). G.f.: -x*(-2+2*x^2+x^3) / ( (x-1)^2*(1+x)^2 ).
a(n+1)-a(n) = (-1)^n*A008619(n+1).
a(n) = A064680(n)-A022998(n-1).
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CROSSREFS
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Cf. A147657.
Sequence in context: A029345 A153149 A249072 * A045450 A029222 A162350
Adjacent sequences: A174004 A174005 A174006 * A174008 A174009 A174010
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KEYWORD
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easy,sign
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AUTHOR
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Paul Curtz, Mar 05 2010
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STATUS
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approved
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