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A036548
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a(n) = T(7,n), array T given by A048471.
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2
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1, 129, 513, 1665, 5121, 15489, 46593, 139905, 419841, 1259649, 3779073, 11337345, 34012161, 102036609, 306109953, 918329985, 2754990081, 8264970369, 24794911233, 74384733825, 223154201601, 669462604929, 2008387814913
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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) = 3*a(n-1) + 126.
a(n) = 4*a(n-1) - 3*a(n-2).
G.f.: (1+125*x)/((1-x)*(1-3*x)). (End)
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PROG
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CROSSREFS
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n-th difference of a(n), a(n-1), ..., a(0) is 2^(n+6) for n=1, 2, 3, ...
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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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