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A017248
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a(n) = (9*n + 7)^4.
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1
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2401, 65536, 390625, 1336336, 3418801, 7311616, 13845841, 24010000, 38950081, 59969536, 88529281, 126247696, 174900625, 236421376, 312900721, 406586896, 519885601, 655360000, 815730721, 1003875856
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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.: -(2401 + 53531*x + 86955*x^2 + 14561*x^3 + 16*x^4)/(x-1)^5. - R. J. Mathar, Mar 20 2018
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MATHEMATICA
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(9Range[0, 20]+7)^4 (* or *) LinearRecurrence[{5, -10, 10, -5, 1}, {2401, 65536, 390625, 1336336, 3418801}, 30] (* Harvey P. Dale, Aug 13 2023 *)
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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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