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A011900
a(n)=6*a(n-1)-a(n-2)-2, with a(0)=1, a(1)=3.
+0
10
1, 3, 15, 85, 493, 2871, 16731, 97513, 568345, 3312555, 19306983, 112529341, 655869061, 3822685023, 22280241075, 129858761425, 756872327473, 4411375203411, 25711378892991, 149856898154533, 873430010034205
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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