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A058896
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a(n) = 4^n - 4.
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7
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-3, 0, 12, 60, 252, 1020, 4092, 16380, 65532, 262140, 1048572, 4194300, 16777212, 67108860, 268435452, 1073741820, 4294967292, 17179869180, 68719476732, 274877906940, 1099511627772, 4398046511100, 17592186044412, 70368744177660, 281474976710652, 1125899906842620
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: 3*(5*x - 1)/(1 - x)/(1 - 4*x).
a(n) = 5*a(n-1) - 4*a(n-2) for n > 1.
E.g.f.: exp(4*x) - 4*exp(x). (End)
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MAPLE
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MATHEMATICA
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PROG
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(PARI) { f=1; for (n = 0, 500, write("b058896.txt", n, " ", f-4); f*=4; ) } \\ Harry J. Smith, Jun 23 2009
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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