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8, 57, 449, 3585, 28673, 229377, 1835009, 14680065, 117440513, 939524097, 7516192769, 60129542145, 481036337153, 3848290697217, 30786325577729, 246290604621825, 1970324836974593, 15762598695796737, 126100789566373889
(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.: (8-15*x)/((1-x)*(1-8*x)).
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PROG
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(Magma) [7*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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