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A115008
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a(n) = a(n-1)+a(n-3)+a(n-4).
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4
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1, 0, 2, 4, 5, 7, 13, 22, 34, 54, 89, 145, 233, 376, 610, 988, 1597, 2583, 4181, 6766, 10946, 17710, 28657, 46369, 75025, 121392, 196418, 317812, 514229, 832039, 1346269, 2178310, 3524578, 5702886, 9227465, 14930353, 24157817, 39088168
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OFFSET
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0,3
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COMMENTS
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a(2n) = F(2n+1) = A001519(n). a(n+2) - a(n+1) - a(n) gives match to A000034, apart from signs.
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LINKS
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FORMULA
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G.f. -(1-x+2*x^2+x^3)/((1+x^2)*(x^2+x-1))
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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