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A017200
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a(n) = (9*n+3)^4.
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1
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81, 20736, 194481, 810000, 2313441, 5308416, 10556001, 18974736, 31640625, 49787136, 74805201, 108243216, 151807041, 207360000, 276922881, 362673936, 466948881, 592240896, 741200625, 916636176
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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*(1 + 251*x + 1131*x^2 + 545*x^3 + 16*x^4)/(1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5). (End)
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MATHEMATICA
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LinearRecurrence[{5, -10, 10, -5, 1}, {81, 20736, 194481, 810000, 2313441}, 20] (* Harvey P. Dale, May 26 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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