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A024147
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a(n) = 12^n - n^7.
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2
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1, 11, 16, -459, 4352, 170707, 2706048, 35008265, 427884544, 5154997383, 61907364224, 742988883517, 8916064616448, 106993142630555, 1283918359135360, 15407021403726993, 184884258626600960
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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) = 20*a(n-1) - 124*a(n-2) + 392*a(n-3) - 742*a(n-4) + 896*a(n-5) - 700*a(n-6) + 344*a(n-7) - 97*a(n-8) + 12*a(n-9) for n > 8.
G.f.: (-13*x^8 - 1431*x^7 - 14200*x^6 - 27745*x^5 - 11946*x^4 - 193*x^3 + 80*x^2 + 9*x - 1)/((x - 1)^8*(12*x - 1)). (End)
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MATHEMATICA
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LinearRecurrence[{20, -124, 392, -742, 896, -700, 344, -97, 12}, {1, 11, 16, -459, 4352, 170707, 2706048, 35008265, 427884544}, 20] (* Harvey P. Dale, May 09 2022 *)
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PROG
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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