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A017199
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a(n) = (9*n + 3)^3.
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1
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27, 1728, 9261, 27000, 59319, 110592, 185193, 287496, 421875, 592704, 804357, 1061208, 1367631, 1728000, 2146689, 2628072, 3176523, 3796416, 4492125, 5268024, 6128487, 7077888, 8120601, 9261000
(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.: 27*(1 + 60*x + 93*x^2 + 8*x^3)/ (x-1)^4. - R. J. Mathar, Aug 01 2014
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PROG
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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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