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A036605 a(n)=a(n-2)+2*a(n-3)+a(n-4). +0
2
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 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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