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 A010980 #44 May 07 2025 11:18:33
%S A010980 1,28,406,4060,31465,201376,1107568,5379616,23535820,94143280,
%T A010980 348330136,1203322288,3910797436,12033222880,35240152720,98672427616,
%U A010980 265182149218,686353797976,1715884494940,4154246671960,9762479679106,22314239266528,49699896548176
%N A010980 a(n) = binomial(n,27).
%H A010980 T. D. Noe, <a href="/A010980/b010980.txt">Table of n, a(n) for n = 27..1000</a>
%H A010980 <a href="/index/Rec#order_28">Index entries for linear recurrences with constant coefficients</a>, signature (28,-378,3276,-20475,98280,-376740,1184040,-3108105,6906900,-13123110,21474180,-30421755,37442160,-40116600,37442160,-30421755,21474180,-13123110,6906900,-3108105,1184040,-376740,98280,-20475,3276,-378,28,-1).
%F A010980 From _Zerinvary Lajos_, Aug 18 2008: (Start)
%F A010980 a(n) = C(n,27), n >= 27.
%F A010980 G.f.: x^27/(1-x)^28. (End)
%F A010980 From _Amiram Eldar_, Dec 11 2020: (Start)
%F A010980 Sum_{n>=27} 1/a(n) = 27/26.
%F A010980 Sum_{n>=27} (-1)^(n+1)/a(n) = A001787(27)*log(2) - A242091(27)/26! = 1811939328*log(2) - 233492834118075846/185910725 = 0.9665300296... (End)
%p A010980 seq(binomial(n,27),n=27..51); # _Zerinvary Lajos_, Aug 18 2008
%t A010980 Table[Binomial[n,27],{n,27,60}] (* _Vladimir Joseph Stephan Orlovsky_, Apr 26 2011 *)
%o A010980 (Magma) [Binomial(n, 27): n in [27..60]]; // _Vincenzo Librandi_, Jun 12 2013
%o A010980 (PARI) x='x+O('x^50); Vec(x^27/(1-x)^28) \\ _G. C. Greubel_, Nov 23 2017
%Y A010980 Cf. A010976, A010977, A010978, A001787, A242091.
%K A010980 nonn,easy
%O A010980 27,2
%A A010980 _N. J. A. Sloane_