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A055849
a(n)=3a(n-1)-a(n-2); a(0)=1, a(1)=9.
+0
4
1, 9, 26, 69, 181, 474, 1241, 3249, 8506, 22269, 58301, 152634, 399601, 1046169, 2738906, 7170549, 18772741, 49147674, 128670281, 336863169, 881919226, 2308894509, 6044764301, 15825398394, 41431430881, 108468894249
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Maintained by
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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