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0, 6, 12, 42, 120, 366, 1092, 3282, 9840, 29526, 88572, 265722, 797160, 2391486, 7174452, 21523362, 64570080, 193710246, 581130732, 1743392202, 5230176600, 15690529806, 47071589412, 141214768242, 423644304720, 1270932914166
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 2*a(n-1)+3*a(n-2).
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MATHEMATICA
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LinearRecurrence[{2, 3}, {0, 6}, 30] (* Harvey P. Dale, Jun 09 2017 *)
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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