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A017332
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a(n) = (10*n + 5)^4.
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1
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625, 50625, 390625, 1500625, 4100625, 9150625, 17850625, 31640625, 52200625, 81450625, 121550625, 174900625, 244140625, 332150625, 442050625, 577200625, 741200625, 937890625, 1171350625, 1445900625, 1766100625, 2136750625, 2562890625, 3049800625, 3603000625
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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.: -625*(x^4 + 76*x^3 + 230*x^2 + 76*x+1)/(x-1)^5. - Colin Barker, Nov 14 2012
Sum_{n>=0} 1/a(n) = Pi^4/60000. (End)
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MATHEMATICA
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Table[(10*n + 5)^4, {n, 0, 30}] (* Amiram Eldar, Apr 18 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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