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1, 16, 144, 1240, 10656, 91816, 793584, 6880120, 59823936, 521638216, 4560526224, 39970994200, 351149013216, 3091621642216, 27274838966064, 241075504183480, 2134495165562496, 18928981513351816, 168109033806481104
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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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G.f.: 1/(1-9*x)+1/(1-8*x)-1/(1-x). E.g.f.: e^(9*x)+e^(8*x)-e^x.
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MATHEMATICA
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Table[9^n+8^n-1, {n, 0, 20}] (* or *) LinearRecurrence[{18, -89, 72}, {1, 16, 144}, 20] (* Harvey P. Dale, Jun 14 2016 *)
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PROG
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CROSSREFS
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Cf. A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656, A155657, A155658, A155659, A155660, A155661, A155662.
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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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