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 A015417 #17 Sep 08 2022 08:44:39
%S A015417 1,-90909090909,9182736455455463728191,
%T A015417 -917356289256280909173471073462809,
%U A015417 91744803405968779530929125886960513398447191,-9174388596710909926545613072877527255280907421320652809
%N A015417 Gaussian binomial coefficient [ n,11 ] for q=-10.
%D A015417 J. Goldman and G.-C. Rota, The number of subspaces of a vector space, pp. 75-83 of W. T. Tutte, editor, Recent Progress in Combinatorics. Academic Press, NY, 1969.
%D A015417 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A015417 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A015417 Vincenzo Librandi, <a href="/A015417/b015417.txt">Table of n, a(n) for n = 11..100</a>
%F A015417 a(n) = Product_{i=1..11} ((-10)^(n-i+1)-1)/((-10)^i-1). - _Vincenzo Librandi_, Nov 06 2012
%t A015417 Table[QBinomial[n, 11, -10], {n, 11, 20}] (* _Vincenzo Librandi_, Nov 06 2012 *)
%o A015417 (Sage) [gaussian_binomial(n,11,-10) for n in range(11,16)] # _Zerinvary Lajos_, May 28 2009
%o A015417 (Magma) r:=11; q:=-10; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // _Vincenzo Librandi_, Nov 06 2012
%K A015417 sign,easy
%O A015417 11,2
%A A015417 _Olivier Gérard_