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A057819
a(0)=4, a(1)=9, a(n)=4a(n-1)-a(n-2).
+0
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4, 9, 32, 119, 444, 1657, 6184, 23079, 86132, 321449, 1199664, 4477207, 16709164, 62359449, 232728632, 868555079, 3241491684, 12097411657, 45148154944, 168495208119, 628832677532, 2346835502009, 8758509330504, 32687201820007
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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