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URL: https://oeis.org/A016757

⇱ A016757 - OEIS

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A016757
a(n) = (2*n+1)^5.
9
1, 243, 3125, 16807, 59049, 161051, 371293, 759375, 1419857, 2476099, 4084101, 6436343, 9765625, 14348907, 20511149, 28629151, 39135393, 52521875, 69343957, 90224199, 115856201, 147008443, 184528125, 229345007, 282475249, 345025251, 418195493, 503284375, 601692057
OFFSET
0,2
FORMULA
G.f.: (1+x)*(x^4 +236*x^3 +1446*x^2 +236*x +1)/(x-1)^6 . - R. J. Mathar, Jul 07 2017
From Amiram Eldar, Oct 10 2020: (Start)
Sum_{n>=0} 1/a(n) = 31*zeta(5)/32.
Sum_{n>=0} (-1)^n/a(n) = 5*Pi^5/1536 (A175571). (End)
MATHEMATICA
Table[(2*n+1)^5, {n, 0, 30}] (* G. C. Greubel, Sep 15 2018 *)
LinearRecurrence[{6, -15, 20, -15, 6, -1}, {1, 243, 3125, 16807, 59049, 161051}, 30] (* Harvey P. Dale, Sep 04 2022 *)
PROG
(Magma) [(2*n+1)^5: n in [0..30]]; // Vincenzo Librandi, Sep 07 2011
(Maxima) makelist((2*n+1)^5, n, 0, 20); /* Martin Ettl, Nov 12 2012 */
(PARI) vector(30, n, n--; (2*n+1)^5) \\ G. C. Greubel, Sep 15 2018
CROSSREFS
Cf. A175571.
Sequence in context: A269056 A209507 A226777 * A133550 A029700 A224003
KEYWORD
nonn,easy
STATUS
approved