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7, 49, 385, 3073, 24577, 196609, 1572865, 12582913, 100663297, 805306369, 6442450945, 51539607553, 412316860417, 3298534883329, 26388279066625, 211106232532993, 1688849860263937, 13510798882111489, 108086391056891905
(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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a(n) = 8*a(n-1)-7.
a(n) = 9*a(n-1)-8*a(n-2).
G.f.: 7*(1-2*x)/((1-x)*(1-8*x)).
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PROG
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(Magma) [6*8^n+1: n in [0..30]];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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