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A055845
a(n)=4a(n-1)-a(n-2); a(0)=1, a(1)=8.
+0
3
1, 8, 31, 116, 433, 1616, 6031, 22508, 84001, 313496, 1169983, 4366436, 16295761, 60816608, 226970671, 847066076, 3161293633, 11798108456, 44031140191, 164326452308, 613274669041, 2288772223856
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Maintained by
N. J. A. Sloane
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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