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A120893
a(n)=3*a(n-1) + 3*a(n-2) - a(n-3) ; a(0)=1,a(1)=1,a(2)=5.
+0
3
1, 1, 5, 17, 65, 241, 901, 3361, 12545, 46817, 174725, 652081, 2433601, 9082321, 33895685, 126500417, 472105985, 1761923521, 6575588101, 24540428881, 91586127425, 341804080817, 1275630195845, 4760716702561, 17767236614401
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Maintained by
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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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