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A017236
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a(n) = (9*n + 6)^4.
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1
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1296, 50625, 331776, 1185921, 3111696, 6765201, 12960000, 22667121, 37015056, 57289761, 84934656, 121550625, 168896016, 228886641, 303595776, 395254161, 506250000, 639128961, 796594176, 981506241, 1196883216, 1445900625, 1731891456, 2058346161, 2428912656
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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.: -81*(16 + 545*x + 1131*x^2 + 251*x^3 + x^4)/(x-1)^5. - R. J. Mathar, Mar 20 2018
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MATHEMATICA
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(9*Range[0, 20]+6)^4 (* or *) LinearRecurrence[{5, -10, 10, -5, 1}, {1296, 50625, 331776, 1185921, 3111696}, 20] (* Harvey P. Dale, Aug 01 2022 *)
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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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