This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A016761 #27 Sep 08 2022 08:44:41
%S A016761 1,19683,1953125,40353607,387420489,2357947691,10604499373,
%T A016761 38443359375,118587876497,322687697779,794280046581,1801152661463,
%U A016761 3814697265625,7625597484987,14507145975869,26439622160671,46411484401953,78815638671875,129961739795077,208728361158759
%N A016761 a(n) = (2*n+1)^9.
%H A016761 Vincenzo Librandi, <a href="/A016761/b016761.txt">Table of n, a(n) for n = 0..10000</a>
%H A016761 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (10,-45,120,-210,252,-210,120,-45,10,-1).
%F A016761 a(n) = 10*a(n-1) -45*a(n-2) +120*a(n-3) -210*a(n-4) +252*a(n-5) -210*a(n-6) +120*a(n-7) -45*a(n-8) +10*a(n-9) -a(n-10). - _Harvey P. Dale_, Jul 25 2013
%F A016761 From _Amiram Eldar_, Oct 11 2020: (Start)
%F A016761 Sum_{n>=0} 1/a(n) = 511*zeta(9)/512.
%F A016761 Sum_{n>=0} (-1)^n/a(n) = 277*Pi^9/8257536 (A258816). (End)
%t A016761 (2Range[0,20]+1)^9 (* or *) LinearRecurrence[{10,-45,120,-210,252,-210, 120,-45, 10,-1},{1,19683,1953125,40353607,387420489,2357947691, 10604499373, 38443359375,118587876497,322687697779}, 20] (* _Harvey P. Dale_, Jul 25 2013 *)
%o A016761 (Magma) [(2*n+1)^9: n in [0..30]]; // _Vincenzo Librandi_, Sep 07 2011
%o A016761 (PARI) vector(30, n, n--; (2*n+1)^9) \\ _G. C. Greubel_, Sep 15 2018
%Y A016761 Cf. A016749, A258816.
%K A016761 nonn,easy
%O A016761 0,2
%A A016761 _N. J. A. Sloane_