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A036605
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a(n) = a(n-2) + 2*a(n-3) + a(n-4).
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2
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1, 4, 4, 7, 13, 19, 31, 52, 82, 133, 217, 349, 565, 916, 1480, 2395, 3877, 6271, 10147, 16420, 26566, 42985, 69553, 112537, 182089, 294628, 476716, 771343, 1248061, 2019403, 3267463, 5286868, 8554330, 13841197, 22395529, 36236725
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listen;
history;
text;
internal format)
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OFFSET
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0,2
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REFERENCES
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D. E. Knuth, Art of Computer Programming, Vol. 3, Sect. 5.4.2, Eq. (25).
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LINKS
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FORMULA
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MAPLE
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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