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A077873
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Expansion of (1-x)^(-1)/(1-x+x^2+2*x^3).
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1
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1, 2, 2, -1, -6, -8, 1, 22, 38, 15, -66, -156, -119, 170, 602, 671, -270, -2144, -3215, -530, 6974, 13935, 8022, -19860, -55751, -51934, 43538, 206975, 267306, -26744, -707999, -1215866, -454378, 2177487, 5063598, 3794868, -5623703, -19545766, -21511798, 9281375, 69884706, 103626928
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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) = 2*a(n-4)-a(n-3)-2*a(n-2)+2*a(n-1). - Robert Israel, May 19 2014
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MAPLE
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N:= 100; # to get a(n) for n <= N
A:= <<0, 1, 0, 0>|<0, 0, 1, 0>|<0, 0, 0, 1>|<2, -1, -2, 2>>:
seq(<1|2|2|-1> . A^j . <1, 0, 0, 0>, j=0..N); # Robert Israel, May 19 2014
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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