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 A015315 #19 Dec 07 2019 12:18:18
%S A015315 1,-53144,3177326971,-187360965026144,11065164158125239526,
%T A015315 -653375813208979143531248,38581260992855637306941215162,
%U A015315 -2278184404047301621409794099651808
%N A015315 Gaussian binomial coefficient [ n,5 ] for q = -9.
%D A015315 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 A015315 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.
%D A015315 M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
%H A015315 Vincenzo Librandi, <a href="/A015315/b015315.txt">Table of n, a(n) for n = 5..200</a>
%H A015315 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (-53144,353042235,256976057520,-20846790934515,-185301670206744,205891132094649).
%F A015315 G.f.: -x^5 / ( (x-1)*(81*x-1)*(9*x+1)*(729*x+1)*(6561*x-1)*(59049*x+1) ). - _R. J. Mathar_, Aug 04 2016
%t A015315 Table[QBinomial[n, 5, -9], {n, 5, 20}] (* _Vincenzo Librandi_, Oct 29 2012 *)
%o A015315 (Sage) [gaussian_binomial(n,5,-9) for n in range(5,13)] # _Zerinvary Lajos_, May 27 2009
%K A015315 sign,easy
%O A015315 5,2
%A A015315 _Olivier Gérard_, Dec 11 1999